Although ATOMS2, SETF2, PRO2, and LINE1 check these files partly for consistency, small errors here can have large influence on the resulting model atmospheres.
All programs terminate in the case of fatal errors but can give only warnings when the input is ambiguous. The neglection of these warnings may be fatal!
For PRO2 and LINE1 output options are existing to print the model atoms and atomic data read by these programs. They should be used for checks -- not only at the first time when the program is running with new or modified data!