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Workspace Method pnd_fieldExpand1D
Maps a 1D pnd_field to a (homogeneous) 2D or 3D pnd_field.
This method takes a 1D pnd_field and converts it to a 2D or 3D
"cloud". It is assumed that a complete 1D case has been created,
and after this atmosphere_dim, lat_grid, lon_grid and
cloudbox_limits have been changed to a 2D or 3D case (without
changing the vertical extent of the cloudbox.
No modification of pnd_field is made for the pressure dimension.
At the latitude and longitude cloudbox edge points pnd_field is set to
zero. This corresponds to nzero=1. If you want a larger margin between
the lat and lon cloudbox edges and the "cloud" you increase
*nzero*, where *nzero* is the number of grid points for which
pnd_field shall be set to 0, counted from each lat and lon edge.
See further AtmFieldsExpand1D.
Authors: Patrick Eriksson