SIRTF IRAC Test Data, Ghost Image Data

Ghost Image 
  This is a crosstalk between channels affect.
  A bright point source in one channel causes a ghost image in another channel that 
  is not viewing the source. The worst case is a source in channel 3 causing a ghost
  in channel 4 of 0.04% of the channel 3 intensity (according to Hora et al). SSC
  will provide an estimate of the level.

To create our test ghost images we took a 256 x 256 pixel section in the lower left 
corner of the big WFPC2 image (x=50, y=50) and for channels 1, 2, & 3, multiplied 
the intensity by 0.01%.  For channel 4, we multiplied the intensity by 0.04%.