Fix typo which introduced a small error in rf.
Fix typo which introduced a small error in rf.


Sciumo/GeographicLib,Sciumo/GeographicLib,Sciumo/GeographicLib,geographiclib/geographiclib,Sciumo/GeographicLib,geographiclib/geographiclib,Sciumo/GeographicLib,Sciumo/GeographicLib,Sciumo/GeographicLib,geographiclib/geographiclib,geographiclib/geographiclib,Sciumo/GeographicLib