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J/ApJS/167/1/table3 Galaxy groups and clusters from SDSS (Berlind+, 2006)
Group and Cluster Catalogs for Samples Mr20, Mr19, and Mr18 (8148 rows)
  recno=7028
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ColumnValue  Explain   (UCD)
_RAJ200001 49 49.32673 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEJ2000+13 10 19.6320 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_RAB195001 47 08.50823 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEB1950+12 55 27.8145 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_Glon144.13625590 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat-47.28160781 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)
7028recno 7028  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

SampMr18  The volume-limited sample (Note G1)   (src.sample)
Group 608  (i) Group identification number (linked to galaxies of this group ) (Note 1)   (meta.id;meta.main)
RAJ2000027.455528 deg (i) Right Ascension (J2000) of group centroid (pos.eq.ra;meta.main)
DEJ2000+13.172120 deg (i) Declination (J2000) of group centroid (pos.eq.dec;meta.main)
z 0.01658  Mean redshift of the group (src.redshift)
Rich 7  Group richness (src.class.richness)
rMAG-21.785 mag Total group r band absolute magnitude (phys.magAbs)
g-r 0.927 mag Total group (g-r) color index (phot.color;em.opt.B;em.opt.R)
sigma 198.1 km/s Group velocity dispersion (phys.veloc.dispersion)
RPerp 0.232 Mpc Group projected rms radius (in h–1Mpc) (stat.stdev;phys.size.radius;pos.lg)
Redge 26.9 Mpc Perpendicular distance of group center from survey edge (in h–1Mpc) (pos.distance)
  
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