Delta
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Delta defines width painted by the same colour.

ASCAN's Hipsometry Dialog:

Edit Delta
key-in:

ascan hipsometry delta number

If for example delta = 0.01 then points with elevation between 0.00 and 0.01 have color from first item in color table (usually blue).
In this case it is possible to paint 255x0.01 = 2.55 units and points at distance between 2.54 and 2.55 will have last item in color table (usually brown).