pltotf programs. The PL format, optimized for usability instead of space, does not make the same use of references that the TFM format does. For instance, many characters in a font may use the same character width, which would be represented only once in the TFM format, and this value would be referenced by each character, since the index would be significantly smaller than the full-precision numerical value. In the PL format, however, the full value is written out each time it appears. For example, this is the code for the upper-case letter Y in Computer Modern Roman, ten point: The kerning values seen here are copied from another section of the PL file in order to make it easier to read, which in itself is redundant. Notice how the full numeric values of the kerning constants are written out each time they appear, instead of being stored once and referred to by a much smaller index. Notes References External links Description of the TFM File Format Digital typography Font formats Typesetting