Thermal gas pressure
Pressure is used in isobaric models. For isochoric models, thermal pressure is computed by the code.
Typical values: 1E3 - 1E8 K 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