Re:

[Petr M. <mi...@ph...>]

> > I propose to change the message
> >  Notice: cannot contour non grid data!
> > into
> >  Notice: Cannot contour non grid data. Please use "set dgrid3d".
> > Any objections?
> 
> Yes.  "set dgrid3d" is far from being the single, obvious solution to the
> problem.  A good portion of people having this problem simply don't know about
> grid-structured data files.  For them dgrid3d would be the wrong thing to do.
> 
> If you want to put a recommendation, make it a reference to (a to-be written
> node of) the manual.

It could be changed to:
	... Please see "help dgrid3d".
however, the user will do so if he doesn't know about "set dgrid3d", so
I let the former message.

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PM