# The P file option¶

When a PFile name is given in the param.dat file, then this file is used to read multiple values for P. This option is useful to speed up the performance, because multiple reads from the data files can be avoided. Too many entries in the Pfile can lead to a memory shortage.

For example:

1.0
10.0
100.0


# The Species file option¶

This option must be used to calculate opacities for gas mixtures, containing multiple species. The File contains in the two columns the species name, and the number fraction.

For example:

01_hit16    0.9
05_hit16    0.1


This example will produce an opacitiy with 90% H2O and 10% CO.