BaseMap.submap now returns a new Map instance instead of working on the object itself.
BaseMap.submap now returns a new Map instance instead of working on the object itself.

dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,mjm159/sunpy,Alex-Ian-Hamilton/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,mjm159/sunpy