The most comprehensive plotting routine available is AST_GRID, which
can be used to draw labelled coordinate axes and, optionally, to
overlay coordinate grids on the plotting area
(Figure ). The routine is straightforward to use,
simply requiring a pointer to the Plot and a STATUS argument:
CALL AST_GRID( PLOT, STATUS )
It will draw both linear and curvilinear axes and grids, as required by the particular Plot. The appearance of the output can be modified in a wide variety of ways by setting various Plot attributes.
AST A Library for Handling World Coordinate Systems in Astronomy