pps You should comment out the "Axes_macro.inc" include statement in 
'spheregrid_demo.pov' so that anyone downloading just the SphereGridMacro 
contribution doesn't get errors saying that the include file is missing. 
Another option would be to use the file_exists() function to test whether 
the person running 'spheregrid_demo.pov' has also downloaded that include 
file:
  #if (file_exists("Axes_macro.inc"))
     #include "Axes_macro.inc"
      ....
  #end

Regards,
Chris B

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