wc_file fileThe file must contain three columns: Column 1 is the altitude in km, column 2 the liquid water content (LWC) in grams per cubic meter, and column 3 the effective droplet radius in micrometer. Empty lines are ignored. Comments start with #. Note that the definition of cloud altitudes in wc_file refers to sea level, not to altitude above ground. E.g., when altitude is set to 1.63km, and the first cloud level is defined at 3km, the cloud would start at 1.37km above ground. An example of a cloud is given in examples/WC.DAT.
Per default the cloud properties are interpreted as layer properties. Before
version 1.4 the default was level properties: The optical depth of a layer was
calculated using information from the upper and lower levels defining the layer,
see wc_layer and wc_level.
To switch to the old behaviour, use wc_level. See section about water clouds
for a realistic example how the contents of the wc_file are converted to optical properties.