The permanent ITF artifacts have been cataloged and both the artifacts
and reseaux have been removed from the ITF images with a bi-linear
interpolation scheme. The location of the specific pixels affected by
either an artifact or reseau mark have been preserved in an
ITF-dependent ``permanent blemish'' reference image. This image is used
in the pipeline processing during the PHOTOM step to flag pixels
in the science image whose location is coincident to those of the ITF
blemishes. The 
flag values corresponding to permanent ITF
artifacts and reseaux are -2048 and -4096, respectively. Because the
ITF has been spatially interpolated in these regions, the accuracy of
PHOTOM is somewhat degraded in the vicinity of the pertinent
artifacts and reseaux.