Convergence is checked for the total temperature, mass flow, total pressure
and geometry separately. Convergence is reaches if the change in solution in
the last iteration does not exceed 
![]() of the largest change
in this network calculation or
 of the largest change
in this network calculation or ![]() times the largest absolute value
within the network (cf. checkconvnet.c).
 times the largest absolute value
within the network (cf. checkconvnet.c).