user interface: MultiDiffMeasureEditor
| field | type | contents / default value | |
| v_from | double | 1.0 | variable: v_from type: double |
| v_to | double | 10.0 | variable: v_to type: double |
| nstep | integer | 50 | variable: nstep type: integer |
| logsteps | boolean | false | variable: logsteps type: boolean |