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Method
The method used depends on whether after specifying the grid
axes, there remain any free parameters. If there are none, then
SGRID simply performs a model evaluation and calculates the
statistic at each grid point. If there are free parameters,
then a minimisation is performed at each grid point using the
iteration and slope control parameters MAX and MINS. The latter
mode is much slower than the former and grid sizes should be
chosen with discretion.
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