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[sepideh20]

Thanks again David. But still I have another problem, I set the look table as
follows:
lut.SetNumberOfColors(256);
lut.SetHueRange(0.0, 0.667);
lut.Build();
however, some times my scalar values are around 4000 and some thing like
this or some times very very small amounts, less than zero. 

I think in these cases, my program does not work well. and I do not know
what happened to the very very small or very very large values. how can I
solve that?

Also please notice that I am working with time varying data set, for each
time step, I have a grid with different scalar values from the other time
steps. 

Any idea is appreciated. 

Many thanks, 



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