Command line parameter to change gmapping resolution

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I have another question with gmapping, is there a parameter that can be set at runtime that will change the resolution of the map generated?
Also is there a paramter to set the size of the map generated?

I am kind of looking for something like this:

rosrun gmapping slam_gmapping scan:=base_scan resolution=1 width=200 height=200

But this doesn't work. I don't want the occupancy grid to be 4k X 4k. Thanks, BM