The Combine Csim / Flow feature generates a new theme considering both C sim, internal mean and mean flow. The resulting theme will display the C sim, internal mean classification by colour-coding the legend and the mean flow by stretch width. The only option offered to users is to specify the number of classes per value. The classes will be formed on the definition: one class for zero values and equal distances for all other classes.
The automatically generated legend can be edited using the ARCVIEW legend
editor (as mentioned in the tutorial introduction). You should save this
manually created legend file to the scenario directory to reload on demand
because the additionally generated analysis themes will not be saved with
the scenario.