Reads an an image file in the native format used by the Santa Barbara
Instrument Group (SBIG) astronomical CCD cameras, and produces a porta-
ble graymap as output. Additional information on SBIG cameras and doc-
umentation of the file format is available at the Web site:
John Walker (http://www.fourmilab.ch/), January 1998. This program is
in the public domain.
23 January 98 sbigtopgm(1)
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