GRAFFER
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Graffer is an interactive tool for generating plots of data and/or
functions. 

The original graffer was an IDL program. This version provides most of
the same functionality in a Fortran program using gtk-fortran and
plplot for the GUI and plotting respectively.

To display functions gdl (gnudatalanguage) or IDL is required.

As well as the main Fortran program, a number of gdl/idl procedures are
included that allow the programmatic generation of graffer plot files.