In our maps all legends have 20 equal interval categories running from dark blue (low) to red (high). The RGB values of the categories are:

cat20 (high) 255   0   0
cat19        255  68   0
cat18        255 106   0
cat17        255 140   0
cat16        255 174   0
cat15        255 208   0
cat14        255 242   0
cat13        241 255  51
cat12        222 255  89
cat11        196 255 125
cat10        167 255 161
cat9         130 255 197
cat8          82 255 229
cat7          23 243 255
cat6          48 203 255
cat5          59 163 255
cat4          59 127 255
cat3          54  94 255
cat2          38  56 255
cat1 (low)     8   8 255

All inputs (s1, p2 etc) are stretched the same way: from the overall minimum of the inputs to the overall maximum of the inputs in 20 intervals, using the weight field. 

Likewise, all 4 mineral system components are stretched the same way: from the overall minimum of the components to the overall maximum of the components in 20 intervals, using the floating point pixel value.

The final_model is stretched over its own range, using the floating point pixel value.

For ArcGIS users, some sample layer files are supplied. There are layer files which symbolise d1, drivers, and final_model. The layer file for d1 can be used to symbolise all inputs, and the layer file for drivers can be used to symbolise all mineral system components.