The "At 400" shows how to extend a region around a specific value. The same way it should be possible to shrink a region - in your case [-100, 100].
Mapping all values from this region to the same pixel position breaks bijection, but you could choose something tiny - maybe inside the range of one pixel.
Isn't that what you are looking for ?
Uwe
ckieschnick (28th August 2019)
It seems that I was missing this hint. Thanks.
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