The effects of detector transient behaviour on the PHT32 photometry and spatial 
response pattern has to be accurately determined. The obtained calibration 
images will ultimately serve as the basis for the development of techniques to
remove these effects from all PHT32 observations, incl. the ghost image 
introduced by the saw-tooth chopping mode on bright sources. 
In conjunction with existing beam measurements (and vignetting measurements) 
the measurements will be used for the development of semi-empirical models for 
the detector behaviour in the PHT32 context. Such models would aim to describe 
the detector data for any combination of source and background brightnesses. 
The models would be the basic building block for the deconvolution of the non- 
linear detector response from illumination and would be the essential step 
towards the deconvolution of the point spread function from the data.

Here: repetition of failed P22 observations on HR1457