ic_saturate switch [relative_humidity]where switch is on, off, or ipa. The second optional argument determines the relative humidity in (with respect to water!) inside the cloud. The default value is 100. ipa is only relevant for independent column calculations.
The follwing details apply for independent column simulations: Using switch on, the air in all columns will be saturated, if there is a cloud in at least one of the columns (this option should be used for stratiform clouds). Using switch ipa, only cloudy columns are affected (this option should be used for convective cloud fields.)