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method of 0 assumes no outliers. The RANSAC one requires you to give a distance and this one has to be chosen with respect to your noise model/dataset: try with a few pixels (e.g. 2) and keep increasing if you are dis-satisfied by the results.
The Least-Median method uses the median of your valid points and does not assume a distance but it assumes that at least 50% of your points are valid.
