AIPS HELP file for PIXXY in 31DEC09
PIXXY
Type: Adverb (Real*7)
Use: Specifies a pixel position in an image. The first number
gives the column number and the second number gives
the row number. The (1,1) pixel location is the
bottom left corner of the image. Fractional pixel
values can be used.
Null value: 0
Null value usually means at reference pixel