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  • $\begingroup$ Thanks for your advice. I will try to do it with the workaround. Do you have an idea if it is possible to do interpolation of values in between but to avoid extrapolation? $\endgroup$ Commented Oct 14, 2014 at 9:08
  • $\begingroup$ Thanks for your update of the answer. That looks very promising! $\endgroup$ Commented Oct 15, 2014 at 7:35