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hector_mapping does not use a particle filter, but pose estimation using fast scanmatching that is accurate enough to not require multiple hypotheses (such as in a rao-blackwellized particle filter approach like gmapping) in many real world applications. Thus, there is no particle count that you could increase. You could take a shot at adding a particle filter implementation on top of hector_mapping of course, but that´s a non-trivial change.