Thank you for the kind words!

I wonder if the Fortran code might be easier to work with if it were brought more under Perl control by making it a library callable from XS, and/or making it a PDL library? Then you'd be able to just call pgplot commands from Perl and maybe even avoid having to do that by throwing PDL data structures to Fortran to be worked on, then to PDL::Graphics::PGPLOT?

Anyway, good luck with your ongoing work. It sounds very interesting!