... We have developed a format convention that allows one to specify an n -dimensional function in a FITS binary table, the FITS Embedded Function (FEF). The format allows for enumerated values, constants, and analytical functions, and arithmetic combinations of those three. ... FTYPE i : axes of the function evaluation space; these may just be specified as a range or may also appear as a table column (TTYPE j ) if other parameters are to be enumerated along such an axis. ... FTYPE i : . ...