5.3 Input and Output Files

The program PRO2 expects an atomic data file ATOMS (Sect. 2), a frequency grid FGRID (Sect. 3, and a start model MODIN (Sect. 4). Another optional input file (RBF_CUTOFF) can be used to set specific bound-free absorption cross-section equal to 0, starting at a given frequency.
Example:

cat > RBF_CUTOFF << eos
LOW |~| |~| |~| |~| |~| |~| |~| UP |~| |~| |~| |~| |~| |~| |~| |~| CUTOFF-FREQUENCY
C432S |~| |~| |~| |~| |~| C522S |~| |~| |~| |~| |~| 1.0E16
HE28 |~| |~| |~| |~| |~| |~| HE31 |~| |~| |~| |~| |~| |~| 1.2E17
eos

The first record in RBF_CUTOFF (in the above example !) is optional.

The calculated model atmosphere is saved in the file MODOUT.

In case that a model converged, this is indicated by the file STOP. PRO2 will stop immediately in case that a file named STOP exists in the working directory because it assumes convergence then (cf. Sect. 10). This can be used to interrupt PRO2 calculation (e.g. to restart the jobs with a changed input file DATEN.

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