%if PREPARE_MODE = FORECAST %then
        %unset PERIOD_START_DATE
        %unset PERIOD_START_TIME
        %unset PERIOD_END_DATE
        %unset PERIOD_END_TIME
        %unset PERIOD_STEP
        %unset AN_MARS_EXPVER

%if PREPARE_MODE = PERIOD %then
        %unset INPUT_SOURCE
        %unset DATE
        %unset TIME
        %unset STEP

%if INPUT_SOURCE = MARS %then
        %unset INPUT_FILE
        %unset GRID_INTERPOLATION

%if GRID_INTERPOLATION = OFF %then
        %unset AREA
        %unset GRID
