Another situation is ... looks like near degradation.

Using more large number for coefficient of f_external_field.

#declare f_external_field =
function(x, y) {
  2.0*sqrt(x*x + y*y) + 0.2
//^^^
}

This one using 2.0, not to mention 3.0, 4.0,...


The color map:

        color_map {
            [0.00 color rgb <0.19, 0.41, 0.89>]
            [0.20 color rgb <0.22, 0.34, 0.62>]
            [0.40 color rgb <0.17, 0.44, 0.55>]
            [0.60 color rgb <0.22, 0.47,0.40>]
            [0.80 color rgb <0.56, 0.33, 0.24>]
            [1.00 color rgb <0.7, 0.15,0.08>]
        }

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