With USE_EXF_INTERPOLATION set, U and V fields are first interpolated to tracer points by exf_set_uv.F and late to U/V points by exf_mapfields.F. This changes output fields for this experiment but makes cube-sphere vector rotation easier to implement.
With USE_EXF_INTERPOLATION set, U and V fields are first interpolated to
tracer points by exf_set_uv.F and late to U/V points by exf_mapfields.F.
This changes output fields for this experiment but makes cube-sphere
vector rotation easier to implement.

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