Template for common text ISO/UIT-T

the ASCII codes "PF" (hex 0x50 0x46) for three-component floating-point sample images. the ASCII codes "Pf" (hex 0x50 0x66) for one-component floating point sample images. followed by any number of white space (ASCII 32, ASCII 8, ASCII 13 or ASCII 10, i.e. blank space, TAB, CR or LF), a width in pixels formatted as ASCII encoded decimal number, ................
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