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Most of the parameters in this editor come directly from Magics, and are documented on the contour reference page. Parameters not listed there are as follows:
Sets the plotting resolution, in degrees, of GRIB fields encoded in space_view projection. The default is 0.1.
Toggles the scaling of the retrieved fields On / Off. "Retrieved fields" are considered to be fields that have been retrieved from MARS or read from disk but are not the result of a Metview computation. They are expected to be in SI units. If this parameter is On, MAGICS will perform a unit conversion (scaling) on the retrieved fields that it plots, converting these from SI units to units of customary meteorological usage - e.g. Pressure from Pa to hPa/mb, Temperature from K to °C.
Toggles the scaling of the derived fields On / Off. "Derived fields" are considered to be any field that Metview (or command-line MARS computations) has produced as the result of a calculation. If the field you derive is in SI units, set this parameter to On to convert to meteorological style units. E.g. :