These are animated GIFs of the ACIS response, made from FEF files. They are for  two FEF regions, near and far from the readout, and  they show the PHA redistribution (each frame in probability vs PHA) vs energy (frame).  Energy is the 1st counter in the upper left, and the second counter is the fractional area within +-3*sigma of the main peak.

      GIF file                                                             FEF
S0_00_00_rmf.gif  acis4a_x00_y00_FP-110_D1999-09-16fef_phaN0002.fits.gz
S0_00_31_rmf.gif  acis4a_x00_y31_FP-110_D1999-09-16fef_phaN0002.fits.gz
S1_00_00_rmf.gif  acis5a_x00_y00_FP-110_D1999-09-16fef_phaN0002.fits.gz
S1_00_15_rmf.gif  acis5a_x00_y15_FP-110_D1999-09-16fef_phaN0002.fits.gz

The first two are a Front-Illuminated chip, near the readout (00_00) and far from it (00_31).  The next two are for a Back-Illuminated chip.

These should play with your browser configured for in-line gifs, or with xanim.

IDL source code is here.
 

2000.08.17 d.p.huenemoerder dph@space.mit.edu