This file contains the MATH table which allows stretchy glyphs and is considered the master for the MATH table data. This file is in the .ttx format and instead of glyph indicies, it uses glyph names which FontLab does not currently support. Therefore, edit this file for the MATH data corresponding to the current FontLab .vfc master. Then export the FontLab master to .otf format (include font names). Use ttx logix.otf to convert logix.otf to logix.ttx. Note that ttx requires Python 2. Then insert the remainder of this file starting at the tag just before the tag in the logix.ttx file. Then delete logix.otf and use ttx logix.ttx to recreate it with the MATH table included. Open the new logix.otf in FontLab and click on the "tables" button (bottom right buttom). Copy the generated MATH table to a temporary buffer. Close logix.otf and open logix.vfc and import the MATH table from the temporary buffer. Make sure it is set for export (click button to immediate left of MATH in the list of tables). Then export all of the various formats. Note: Stretchy delimiters starting with index 71 cause an error. They must either be built by hand and added to FontLab's MATH table, or use ttx to build the entry by putting it before index 71 (and not having any past index 70). Once a valid MATH table is imported into FontLab and font files are created, ttx will no longer be able to round trip an .otf file. It will convert an .otf file to a .ttx file, but not conversely. When adding a stretchy delimiter by hand, be sure to update the header for the correct number of stretchy delimiters. Note: FontLab 7 does not import the MATH table or other OpenType tables (except for the .vfc and .vfj files) by default. The "Decompile to XML in Tables" option must be set under "Opent Fonts" in Preferences. This was not necessary in FontLab 6. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=