thx a lot. this seems to work. I don't understand why gridding failed... :-(
But this solution is fine for me, too!
> hi there!
> I just tried your file with "gnuplot 4.2 patchlevel 2" and 4.3 and it
>> set contour
>> splot "rampe.dat" w lines
> although I could recover your plot by doing > d3dgrid 50,200
> leave that out and it'll work
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