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4.3. Testcase #3

This example reads in the neutral hydrogen density determined in the previous example and, assuming the same physical conditions as above, determines the rates for all the processes involved in order to access what are the most important excitation mechanisms.

The results show that the most important excitation mechanism are collisions by neutral hydrogen, with the CMBR making a significant contribution for the 3P1 level excitation.

To run this testcase the user should include the radiation field of the Galaxy in the body of function URAD in module POPRATIO:

urad = Fgal(lambda)