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Maker note tag 0x4001 is UNDEFINED bytes (ColorData versions -3 and -4) on PowerShot and EOS M bodies. It was read as one number per byte, so no plausible as-shot levels were found and the white balance was 1, 1, 1 (green cast, a* about -13 on neutrals). Byte and undefined data is now paired into 16-bit words in the maker note's byte order before the existing probe (word 71). No per-model table. RENDER_CACHE_VERSION 11 -> 12.