A separate technical specification is provided for each of the four variants (PBM, PGM, PNM, and PPM) of this format:
PBM.TXT is a plain ASCII document describing the portable bitmap file format.
PGM.TXT is a plain ASCII document describing the portable graymap file format.
PNM.TXT is a plain ASCII document describing the portable anymap file format.
PPM.TXT is a plain ASCII document describing the portable pixmap file format.
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