As a substitute for the xsym1 font, here is a hotch-potch, "better
than nothing" True Type Font isaxsym.ttf. that does not support super-
and subscripts. Please treat it as a temporary stand-in until better
solutions are available.

Contribution from  Norbert Völker, University of Essex.  
See http://cswww.essex.ac.uk/Research/FSS/projects/isawin/