Since the Maxwell-KS propagator is non-linear, each propagation step should be performed self-consistently. In practice, for most purposes this is not necessary, except perhaps in the first iterations. This variable holds the number of propagation steps for which the propagation is done self-consistently.
This variable controls the accuracy threshold for the self consistency.
call parse_variable(namespace, 'MaxwellTDSCFThreshold', CNST(1.0e-6), tr%scf_threshold)