This is the command subpix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
subpix - AME
SYNOPSIS
subpix [-vn] file.fts x y value...
DESCRIPTION
Subtract from pixel of FITS or IRAF image file
-n: write new file, else overwrite
-v: verbose
Use subpix online using onworks.net services