<commit_before>"""
Frame of reference/coordinates package.

Mathematical model:  The idea of a chart S{phi}: I{U} S{sub} I{M} {->} B{R}^k
on a "manifold" I{M}.  For a chart both input (I{M}) and output coordinates
(B{R}^k) must be defined and a map relating the two coordinate systems.
"""<commit_msg>fix arrow in docstring for epytext markup<commit_after>"""
Frame of reference/coordinates package.

Mathematical model:  The idea of a chart S{phi}: I{U} S{sub} I{M} S{->} B{R}^k
on a "manifold" I{M}.  For a chart both input (I{M}) and output coordinates
(B{R}^k) must be defined and a map relating the two coordinate systems.
"""
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