Commands for EM scattering processes.
| StepLim | type s | Omittable : default value = |
| lat | type b | Omittable : default value = 1 |
| Fr | type d | Omittable : default value = 0.02 |
| Fg | type d | Omittable : default value = 3.5 |
| skin | type d | Omittable : default value = |
| theta | type d | Omittable : default value = | |
| Unit | type s | Parameter candidates : rad mrad sr deg radian milliradian steradian degree |