ic_file fileThe file must contain three columns. Column 1 is the altitude in km, column 2 the ice water content in grams per cubic meter, and column 3 the effective particle radius in micrometer. Note that the definition of cloud altitudes in ic_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. Comments start with #. Empty lines are ignored. An example of an ice cloud is given in examples/IC.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 ic_layer and ic_level.
To switch to the old behaviour, use ic_level. See
section about ice clouds
for a realistic example how the contents of the
ic_file are converted to optical properties.