Proton density, nH
Gas density is fixed to this value for isochoric models. This value is not used for isobaric models in which proton density is computed by the code
Unit: cm-3
G0 at the PDR surface from stellar component
- if <0.0 : star on the observer side
- if >0.0 : star on the back side.
AVmax
Size of the cloud expressed as a visual extinction
Unit: magnitude