Hello!

Thanx to all. I will try to give a running code.

With the dumper there is the problem, that are some hundret values.

ydata => $fnfeld[$ploty[$ii]]->{'fn'},
[download]

This call to gnuplot is working.
But this not:

push @{$plotx{$ii}}, $fnfeld[$xfeld[$i]]->{'fn'};
.
.
.
xdata => $plotx{$ii},
[download]

It is empty.
I will try to create a short standalone code.

Regards buchi