R help - Nov 2010 - Nuisance parameters for Geyer Saturation process.

Hello group,
Can someone please put me through how to estimate the nuisance parameters
(Saturation parameter and radius) for the Geyer saturation process?
It seems quite confusing to me how these parameters are achieved, but they
are very important in determining the interaction between points in a point
process.
I am using Spatstat package.

Thanks.

neba

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