Maximal colors scale of the isovalues

Hello everyone.
I defined a color scale in my freefem code (“from the zone with zero saturation in blue to the zone with high saturation in red”), but at the output on the image the iso-value in the red zone is almost zero and yet the area is very dense. it should turn blue. I would like to know how to correct this or how to set the maximum value of my color.

Thank you for helping me.

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first you use FreeFem-cs and the graphic of FreeFem-cs are not exactly the same of FreeFem++

But you can set the value of plotted iso-value though the named parameter of function plot:
viso = Viso, where Viso is a sorted array of the value of plotted isovalue.

Thank you very much Professor I will try your suggestions.