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This is an excellent piece of work, I've been using it since 2007. Thank you so much for sharing it.
I think, there might be a couple of little bugs with RLimit, both of them appear when RLimit is set in the call to mmpolar.
1) The RLimit max value seems to be working fine, but the RLimit min value doesn't. The plot results in a polar figure which is not centered at the RLimit min value but to a smaller value.
2) Under the same situation as 1 and when RTickValues are not set, an extra Rho axis line or sometimes just the label, appear outside the outer limit of Theta
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