[R] Minus values in Tps

[sam.e]

Hello there, 

I am using the Tps function to fit a spline to my data which is measurements
of a sedimentary layer on an xy plane to see how the thickness of the layer
changes. I was wondering if it was possible to change the Tps code so that
no minus values are calculated by the spline as these are obviously
unfeasible.

Any help would be much appreciated, 

Thanks, 

Sam
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