***WARNING: THERE IS ZERO VOL. FLUX EVERYWHERE IN THE MODEL BASED ON THE
DEFAULT CRITERION FOR ZERO VOL. FLUX RELATIVE TO TIME AVERAGED
VOL. FLUX. PLEASE CHECK THE VALUE OF THE AVERAGE VOL. FLUX DURING
THE CURRENT ITERATION TO VERIFY THAT THE VOL. FLUX IS SMALL ENOUGH
TO BE TREATED AS ZERO. IF NOT, PLEASE USE THE *CONTROLS OPTION TO
MODIFY THE CRITERION FOR ZERO FLUX.