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Common formats for run-length encoded data include Truevision TGA, PackBits (by Apple, used in MacPaint), PCX and ILBM. The International Telecommunication Union also describes a standard to encode run-length colour for fax machines, known as T.45.[6] That fax colour coding standard, which along with other techniques is incorporated into Modified Huffman coding,[citation needed] is relatively efficient because most faxed documents are primarily white space, with occasional interruptions of black.