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- Grid: supply a valid string or list of numbers in the Grid parameter (see below)
- Template: supply a template GRIB file, whose grid structure will be used to generate the output GRIB; use either Template Source or Template Data to specify the template. Note that only GRIB fields on regular lat/lon or regular/reduced Gaussian grids may currently be used as templates.
- Lambert Conformal: supply details of the output grid in the set of Lambert grid definition parameters
- Lambert Azimuthal Equal Area: supply details of the output grid in the set of Lambert grid definition parameters
- Filter: in this mode, the output grid will be the same as the input grid
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