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II/246              2MASS All-Sky Catalog of Point Sources     (Cutri+ 2003)

The 2MASS All-Sky Catalog of Point Sources Cutri R.M., Skrutskie M.F., Van Dyk S., Beichman C.A., Carpenter J.M., Chester T., Cambresy L., Evans T., Fowler J., Gizis J., Howard E., Huchra J., Jarrett T., Kopan E.L., Kirkpatrick J.D., Light R.M, Marsh K.A., McCallon H., Schneider S., Stiening R., Sykes M., Weinberg M., Wheaton W.A., Wheelock S., Zacarias N. <University of Massachusetts and Infrared Processing and Analysis Center (IPAC/California Institute of Technology) (2003)> =2003yCat.2246....0C
ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys Description: The Two Micron All Sky Survey (2MASS) project is designed to close the gap between our current technical capability and our knowledge of the near-infrared sky. In addition to providing a context for the interpretation of results obtained at infrared and other wavelengths, 2MASS will provide direct answers to immediate questions on the large-scale structure of the Milky Way and the Local Universe. To achieve these goals, 2MASS is uniformly scanning the entire sky in three near-infrared bands to detect and characterize point sources brighter than about 1 mJy in each band, with signal-to-noise ratio (SNR) greater than 10, using a pixel size of 2.0". This will achieve an 80,000-fold improvement in sensitivity relative to earlier surveys. 2MASS uses two new, highly-automated 1.3-m telescopes, one at Mt. Hopkins, AZ, and one at CTIO, Chile. Each telescope is equipped with a three-channel camera, each channel consisting of a 256x256 array of HgCdTe detectors, capable of observing the sky simultaneously at J (1.25 µm), H (1.65 µm), and Ks (2.17 µm), to a 3σ limiting sensitivity of 17.1, 16.4 and 15.3mag in the three bands. The 2MASS arrays image the sky while the telescopes scan smoothly in declination at a rate of ∼1' per second. The 2MASS data "tiles" are 6 deg. long in the declination direction and one camera frame (8.5') wide. The camera field-of-view shifts by ∼1/6 of a frame in declination from frame-to-frame. The camera images each point on the sky six times for a total integration time of 7.8 s, with sub-pixel "dithering", which improves the ultimate spatial resolution of the final Atlas Images. The University of Massachusetts (UMass) is responsible for the overall management of the project, and for developing the infrared cameras and on-site computing systems at both facilities. The Infrared Processing and Analysis Center (IPAC) is responsible for all data processing through the Production Pipeline, and construction and distribution of the data products. The 2MASS project involves the participation of members of the Science Team from several different institutions. The 2MASS project is funding by the National Aeronautics and Space Administration (NASA) and the National Science Foundation (NSF). Acknowledging 2MASS in publications: Please include the following in any published material that makes use of the 2MASS data products: "This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation." File Summary: File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file out.sam 382 1000 2MASS Point Source Catalogue, sample output (on a total of 470,992,970 sources)
See also: http://www.ipac.caltech.edu/2mass/ : 2MASS documentation VII/233 : The Two Micron All-Sky Survey: Extended sources (Cutri+ 2003) Nomenclature Notes: As specified by the IAU recommendations on source nomenclature, the object designation is derived from the J2000 sexagesimal coordinates of the source and has the form HHMMSSss±DDMMSSs, where HH are the hours of right ascension, MM the RA minutes and SSss are the centi-seconds of RA. DD are the degrees in declination, MM are DEC minutes and SSs the declination deci-seconds. Note that both the RA centi-seconds of time and DEC deci-seconds of arc are truncated rather than rounded, per the IAU recommendation. Note that when several sources have the same identifier, they are distinguished by a trailing letter: A, B, C, etc... Remark on the Byte-by-byte Description: In the Byte-by-byte Description below, the column names differ slightly compared to the original description, mainly to follow the conventions used in the CDS Standaridzed description of catalogues. The original names are written (in parentheses) in the Explanations. Byte-by-byte Description of file: out.sam
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg (ra) Right ascension (J2000) 12- 21 F10.6 deg DEdeg (dec) Declination (J2000) (dec) 23- 26 F4.2 arcsec errMaj (err_maj) Major axis of position error ellipse 28- 31 F4.2 arcsec errMin (err_min) Minor axis of position error ellipse 33- 35 I3 deg errPA [0,180] (err_ang) Position angle of error ellipse major axis (E of N) 37- 53 A17 --- 2MASS (designation) Source designation (1) -------------------------------------------------------------------------------- 55- 60 F6.3 mag Jmag ?(j_m) J selected default magnitude (2) 62- 66 F5.3 mag Jcmsig ?(j_cmsig) J default magnitude uncertainty (3) 68- 72 F5.3 mag e_Jmag ?(j_msigcom) J total magnitude uncertainty (4) 74- 83 F10.1 --- Jsnr ?(j_snr) J Signal-to-noise ratio 85- 90 F6.3 mag Hmag ?(h_m) H selected default magnitude (2) 92- 96 F5.3 mag Hcmsig ?(h_cmsig) H default magnitude uncertainty (3) 98-102 F5.3 mag e_Hmag ?(h_msigcom) H total magnitude uncertainty (4) 104-113 F10.1 --- Hsnr ?(h_snr) H Signal-to-noise ratio 115-120 F6.3 mag Kmag ?(k_m) K selected default magnitude (2) 122-126 F5.3 mag Kcmsig ?(k_cmsig) K default magnitude uncertainty (3) 128-132 F5.3 mag e_Kmag ?(k_msigcom) K total magnitude uncertainty (4) 134-143 F10.1 --- Ksnr ?(k_snr) K Signal-to-noise ratio -------------------------------------------------------------------------------- 145-147 A3 --- Qflg (ph_qual) JHK Photometric quality flag (5) 149-151 A3 --- Rflg (rd_flg) Source of JHK default mag (6) 153-155 A3 --- Bflg (bl_flg) JHK components fit to source (7) 157-159 A3 --- Cflg (cc_flg) Artifact contamination, confusion (8) 161-166 A6 --- Ndet [0-9] (ndet) Number of aperture measurements (jjhhkk) (9) -------------------------------------------------------------------------------- 168-172 F5.1 arcsec prox Distance between source and nearest neighbour 174-176 I3 deg pxPA ? (pxpa) Position angle of vector from source to nearest neighbour (E of N) 178-187 I10 --- pxCntr (pxcntr) Sequence number of nearest neighbour 189 I1 --- Xflg [0,2] (gal_contam) Extended source contamination (10) 191 I1 --- Aflg [0,1] (mp_flg) Association with asteroid or comet (11) -------------------------------------------------------------------------------- 193-202 I10 --- Cntr (pts_key) Unique source identifier in catalogue 204 A1 --- Hemis [ns] (hemis) Hemisphere of observation 206-215 A10 --- Date (date) Observation date 217-219 I3 --- Scan (scan) Scan number (within date) 221-227 F7.3 deg GLON (glon) Galactic longitude (12) 229-235 F7.3 deg GLAT (glat) Galactic latitude (12) 237-242 F6.1 arcsec Xscan (x_scan) Distance of source from focal plane centerline 244-255 F12.4 d JD (jdate) Julian date of source measurement (13) -------------------------------------------------------------------------------- 257-262 F6.2 --- Jpsfchi ?(j_psfchi) J band reduced chi2 value of fit 264-269 F6.2 --- Hpsfchi ?(h_psfchi) H band reduced chi2 value of fit 271-276 F6.2 --- Kpsfchi ?(k_psfchi) K band reduced chi2 value of fit 278-283 F6.3 mag Jstdap ?(j_m_stdap) J standard aperture magnitude (18) 285-289 F5.3 mag e_Jstdap ?(jmsigstdap) error on Jstdap 291-296 F6.3 mag Hstdap ?(h_m_stdap) H standard aperture magnitude (18) 298-302 F5.3 mag e_Hstdap ?(hmsigstdap) error on Hstdap 304-309 F6.3 mag Kstdap ?(k_m_stdap) K standard aperture magnitude (18) 311-315 F5.3 mag e_Kstdap ?(kmsigstdap) error on Kstdap -------------------------------------------------------------------------------- 317-321 I5 arcsec edgeNS (distedgens) Distance from the source to the nearest North or South scan edge 323-325 I3 arcsec edgeEW (distedgeew) Distance from the source to the nearest East or West scan edge 327-328 A2 --- edge [nsew] (distedgeflg) flag indicating to which edges the edgeNS and edgeEW values refer 330 I1 --- dup (dup_src) Flag indicating duplicate source (14) 332 I1 --- use (use_src) Use source flag (15) -------------------------------------------------------------------------------- 334 A1 --- opt [0UT] (a) Associated optical source (16) 336-338 F3.1 arcsec Dopt ?(dist_opt) Distance to associated optical source 340-342 I3 deg PAopt [0,360]? (phi_opt) position angle from optical source to the 2MASS source position 344-348 F5.2 mag Bmag ?(bmopt) Blue magnitude of associated optical source 350-354 F5.2 mag Rmag ?(vrmopt) Visual or red mag of associated optical source 356 I1 --- Nopt (nopt_mchs) Number of optical sources within 5arcsec (17) -------------------------------------------------------------------------------- 358-364 I7 --- extKey ?(ext_key) Record Identifier in XSC 366-370 I5 --- scanKey (scan_key) Record Identifier in the Scan Information Table 372-378 I7 --- coaddKey (coadd_key) Record Identifier in the Atlas Image Data Table 380-382 I3 --- coadd (coadd) Sequence number of the Atlas Image
Note (1): Sexagesimal, equatorial position-based source name in the form: hhmmssss+ddmmsss[ABC...]. The full naming convention for 2MASS All-Sky Release PSC sources has the form "2MASS Jhhmmssss+ddmmsss[ABC...]", where "2MASS" indicates that the source is from the All-Sky PSC, "J" indicates the position is J2000, and the optional trailing letters are used to distinguish sources with otherwise duplicate names. The "2MASS J" prefix is not listed explicitly in the designation column. Note (2): This is the selected "default" magnitude for each band, [JHK]. If the source is not detected in the band, this is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The origin of the default magnitude is given by the first character of the Rflg value (Rflg). This column is null if the source is nominally detected in the band, but no useful brightness estimate could be made (Rflg="9"). Note (3): This is the corrected photometric uncertainty [JHK]cmsig for the default magnitude. If Rflg="2", this is the measurement error from the profile-fitting procedure, corrected to be consistent with observed repeatability statistics. If Rflg="1" or "4", this is the RMS of the brightness measured in aperture photometry on the individual frames. If Rflg="3", the uncertainty is derived from the residuals to the 1-d radial profile fit to the unsaturated wings of the bright star. If the value is >8.0, it is a flag value indicating that a meaningful uncertainty could not be determined for the source. This column is null if the default magnitude is a 95% confidence upper limit (Rflg="0" or "6") or if the source is not measurable (Rflg="9"). Note (4): Combined, or total photometric uncertainty [JHK]msigcom for the default magnitude in that band. The combined uncertainty is derived from the following relation: e_[JHK]mag = sqrt([JHK]cmsig2 + [JHK]zperr2 + fferr2 + [r1normrms2]) where cmsig = Corrected band photometric uncertainty zperr = Nightly photometric zero point uncertainty = 0.011 mag fferr = Flat-fielding residual error = 0.005 mags r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for sources with Rflg="1") This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the band). Note (5): Three character flag, one character per band [JHK], that provides a summary of the net quality of the default photometry in each band, as derived from the Read Flag (Rflg), measurement uncertainties ([jhk]cmsig), scan signal-to-noise ratios ([jhk]snr), frame-detection statistics (Ndet), and profile-fit reduced chi-squared values ([jhk]psfchi). The value for Qflg is set for a band according to the precedence of the table below. For example, a source that is tested and meets the conditions for category "X" is not tested for subsequent qualities. X = There is a detection at this location, but no valid brightness estimate can be extracted using any algorithm. Rflg="9" and default magnitude is null. U = Upper limit on magnitude. Source is not detected in this band (Rflg="0"), or it is detected, but not resolved in a consistent fashion with other bands (Rflg="6"). A value of Qflg="U" does not necessarily mean that there is no flux detected in this band at the location. Whether or not flux has been detected can be determined from the value of Rflg. When Rflg="0", no flux has been detected. When Rflg="6", flux has been detected at the location where the images were not deblended consistently in all three bands (JHKs). F = This category includes Rflg="1" or Rflg="3" sources where a reliable estimate of the photometric error, [jhk]cmsig, could not be determined. The uncertainties reported for these sources in [jhk]cmsig and e_[jhk]mag are flags and have numeric values >8.0. E = This category includes detections where the goodness-of-fit quality of the profile-fit photometry was very poor (Rflg=2 and [jhk]psfchi>10.0), or detections where psf fit photometry did not converge and an aperture magnitude is reported (Rflg=4), or detections where the number of frames was too small in relation to the number of frames in which a detection was geometrically possible (Rflg="1" or Rflg="2"). A = Detections in any brightness regime where valid measurements were made (Rflg="1","2" or "3") with [jhk]snr>10 AND [jhk]cmsig<0.10857. B = Detections in any brightness regime where valid measurements were made (Rflg="1","2" or "3") with [jhk]snr>7 AND [jhk]cmsig<0.15510. C = Detections in any brightness regime where valid measurements were made (Rflg="1","2" or "3") with [jhk]snr>5 AND [jhk]cmsig<0.21714. D = Detections in any brightness regime where valid measurements were made (Rflg="1","2" or "3") with no [jhk]snr OR [jhk]cmsig requirement. Note (6): The read flag indicates the source of J,H,K "default" magnitudes as a 3-digit integer, where the 1st digit corresponds to the J band, the 2nd to the H band, and the 3rd to the Ks band. Rflg values of "1", "2" or "3" generally indicate the best quality detections, photometry and astrometry (although other quality flags must be considered). Values of "0", "4", "6" and "9" in a band indicate either non-detections, or generally poor quality photometry and positions. The definitions of the Rflg values are: 0 = Source is not detected in this band. The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". 1 = The default magnitude is derived from aperture photometry measurements on the 51 ms "Read_1" exposures. The aperture radius is 4", with the sky background measured in an annulus with an inner radius of 14" and an outer radius of 20". Used for sources that saturate one or more of the 1.3s "Read_2" exposures, but are not saturated on at least one of the 51 ms "Read_1" frames. 2 = The default magnitude is derived from a profile-fitting measurement made on the 1.3 sec "Read_2" exposures. The profile-fit magnitudes are normalized to curve-of-growth corrected aperture magnitudes. This is the most common type in the PSC, and is used for sources that have no saturated pixels in any of the 1.3 sec exposures. 3 = The default magnitude is derived from a 1-d radial profile fitting measurement made on the 51 ms "Read_1" exposures. Used for very bright sources that saturate all of the 51 ms "Read 1" exposures. 4 = The default magnitude is derived from curve-of-growth-corrected 4" radius aperture photometry measurements on the 1.3 s "Read_2" exposures. This is used for sources that are not saturated in any of the Read_2 frames, but where the profile-fitting measurements fail to converge to a solution. These magnitudes are the same as the standard aperture magnitudes (Jstdap, Hstdap, Kstdap), but when they are the default magnitudes, it generally implies that they are low quality measurements. 6 = The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". This is used for pairs of sources which are detected and resolved in another band, but are detected and not resolved in this band. This differs from a Rflg="0" because in this case there is a detection of the source in this band, but it is not consistently resolved across all bands. 9 = The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". This is used for sources that were nominally detected in this band, but which could not have a useful brightness measurement from either profile fitting or aperture photometry. This often occurs in highly confused regions, or very near Tile edges where a significant fraction of the measurement aperture of sky annulus falls off the focal plane. Note (7): Blend flag. Three character flag, one character per band [JHK], that indicates the number of components that were fit simultaneously when estimating the brightness of a source: 0 = Source is not detected, or is inconsistently deblended in that band. 1 = One component was fit to the source in R_2 profile-fitting photometry (Rflg="2"), or default magnitudes are from aperture photometry (Rflg="1" or "4") or saturated star 1-d radial profile-fitting (Rflg="3"). >1 = More than one component was fit simultaneously during R2 profile-fit photometry, where the value of the field is the number of components simultaneously fit. The maximum number of components is 7 in any band for the PSC, so this Bflg is always a three character flag. Multi-component fitting occurs only for profile-fitting, and only when more than one detection is found within ∼5". Single detections that are not well-fit by a single PSF are not split. Note (8): Contamination and confusion flag. Three character flag, one character per band [JHKs], that indicates that the photometry and/or position measurements of a source may be contaminated or biased due to proximity to an image artifact or nearby source of equal or greater brightness. The Cflg in each band is set in hierarchical order according to the following table, in the event a source is affected by more than one artifact or condition: p = Persistence. Source may be contaminated by a latent image left by a nearby bright star. c = Photometric Confusion. Source photometry is biased by a nearby star that has contaminated the background estimation. This is very common in high source density regions. d = Diffraction spike confusion. Source may be contaminated by a diffraction spike from a nearby star. s = Electronic stripe. Source measurement may be contaminated by a stripe from a nearby bright star. b = Bandmerge confusion. In the process of merging detections in the different bands for this source, there was more than one possible match between the different band components. This occurs in regions of very high source density, or when multiple sources were split in one band but not another. 0 = Source is unaffected by known artifacts, or is not detected in the band. Non-zero values the Cflg in any band is an indicator that the measurements of that source may be contaminated. Note (9): ndet is a six-character flag, two characters per band [JJHHKsKs], that indicates the number frames on which a source was detected, N, and the number of frames on which the source could have been measured, M. The first digit in the pair for each band, N, gives the number of frames on which there were >3 sigma aperture photometry detections of the source. The second digit for each band, M, gives the number of frames on which aperture measurements were possible. Normally, M=6, (occasionally M=7 because the scanning step size was slightly less than 1/6 of the frame size). M can be <6 if frames are "lost" because: a) there were masked pixels within the source aperture due to cosmic ray detections, noisy pixels, meteor trails, etc, or b) there were saturated pixels within the source aperture. Values of M<6 are not uncommon, but do indicate an effective loss of coverage and sensitivity for a source. The values of N and M for a band always pertain to the aperture photometry on the 51 ms "Read_1" exposures if Rflg="1", and to the aperture photometry on the 1.3 s "Read_2" exposures if Rflg="2" or "4". Sources that are saturated on all of the Read_1 frames (Rflg="3") have N=0 because no aperture photometry was possible. Sources with signal-to-noise ratios >8-9 should be detected on all available frames. Values of N < M for such sources are an indication of possible loss of measurement integrity. Values of N < M, or even N=0, are normal for fainter sources because they are too faint on individual frames to yield a >3 sigma detection. Note (10): Extended source "contamination" flag. A value of Xflg="2" indicates that this point source falls within the elliptical boundary of an XSC source defined by the semi-major axis and ellipticity of the 20 mag.arcsec-2 Ks-band elliptical isophote (r_k20fe)+10%, for XSC sources where r_k20fe is >10''. Sources so indicated are often foreground stars superimposed on background galaxies, or sometimes extractions of pieces of the galaxy or nebula. The point source photometry for these sources is probably contaminated by the surrounding structured extended emission. Point sources can still be superimposed on extended sources and remain unflagged if the XSC source shape is not well-described by an ellipse. This flag also denotes (Xflg="1") PSC sources that are equivalent to sources in the XSC, but only for XSC sources with r_k20fe is >10''. Since most XSC sources have semi-major axes <10'', Xflg does not identify all PSC sources with exact XSC counterparts. Use the extKey to identify all PSC sources that were found to be resolved relative to a single point-spread function. 0 = Source does not fall within the elliptical profile of an extended source with semi-major axis >10'', or it is not identified exactly with an XSC source with semi-major axis >10''. However, the source may correspond exactly to a smaller XSC source. 1 = Source is resolved by 2MASS, and is equivalent to a source in the XSC that has a semi-major axis >10'' in size. Users must refer to the extKey to identify all PSC sources with XSC counterparts. 2 = Source falls within the elliptical boundary of an XSC source that has a semi-major axis >10'' in size. Note (11): Minor Planet Flag. Indicates if this source is associated with the predicted position of a known minor planet, comet, planet or planetary satellite. This association does not guarantee that the PSC source is a detection of the solar system object. 0 = Source is not associated with a known solar system object 1 = Source is associated with the predicted position of a known solar system object. The name and orbital data for the associated objects are given in the Known Asteroid Detection List, Known Comet Detection List, and Planet and Planetary Satellite Detection List. The associated PSC source is cross-referenced in those Lists via the value of ptsKey. Note (12): Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg. Note (13): The Julian Date of the source measurement is accurate to ±30seconds. This value is extrapolated from the start time of the Survey scan using the difference between the declinations of the source and the first row in the Tile divided by the scanning rate of the telescope (approximately 5sec). The scanning rate of the two 2MASS telescopes was slightly different because of the need to optimize the dithering of images on the arrays. Note (14): Used in conjunction with the use flag, this numerical flag indicates whether the source falls in a Tile overlap region, and if so, if it was detected multiple times. 0 = The source does not fall within a Tile overlap region (use="1"), or it falls in an overlap region and there were no sources detected within 2" of its position in the overlapping Tile (use="0"). 1 = The source falls within a Tile overlap region, and there is one source detected within 2" of its position in the overlapping Tile. >1 = The source falls within a Tile overlap region, and there are multiple sources detected within 2" of its position in the overlapping Tile, and/or within its own Tile. This implies confusion in the multiple source resolution procedure. Note (15): Used in conjunction with the dup flag, this numerical flag indicates if a source falls within a Tile overlap region, and whether or not it satisfies the unbiased selection rules for multiple source resolution. 1 = The source does not fall in a Tile overlap region (dup="0"), or it falls in an overlap region, but lies farther from its scan edge than any apparition of the source in another Tile. A source must have use="1" to be considered part of the sub-Catalog that satisfies the 2MASS Level 1 Science Requirements 0 = The source falls in a Tile overlap region, but does not have a detection within 2" of its position in any overlapping Tiles. PSC sources with use="0" will always have dup="0". Such objects are usually faint, and thus toggling above and below the detection limits, or may have moved between the scans of the different Tiles. Note (16): The catalog ID and other association parameters are given for the closest optical match found within 5 arcsec. The ID consists of a single-letter abbreviation for the catalog (e.g., 'T' for Tycho 2, 'U' for USNO-A2.0). '0' means no optical source was found. Note (17): The optical association information is unreliable for sources with |dec|>86°, because of an error in the 2MASS/USNO-A2.0 position correlation procedure that caused associations to be missed in the vicinity of the equatorial poles. If the source has |dec|>86°, a value of a="0" does not necessarily mean that there is not an optical association within 5 arcsec of the 2MASS position. Note (18): the standard aperture magnitude is the curve-of-growth corrected average brightness measured in a 4" radius aperture centered on the source position on each of the available 1.3 s "Read_2" frames. The column is empty if the source is not detected in the band (Rflg="0"), or if it is saturated in all of the 1.3 s "Read 2" exposures for the band.
History: * 10-Jun-2003: this ReadMe document was prepared from the documents at http://www.ipac.caltech.edu/2mass/releases/allsky/doc/sec2_2a.html
(End) Sebastien Derriere, Francois Ochsenbein [CDS] 18-Jun-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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