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hobby --- a TikZ/PGF library for drawing smooth(ish) curves using
          Hobby's algorithm (implemented in LaTeX3)
E-mail: loopspace@mathforge.org
Released under the LaTeX Project Public License v1.3c or later
See http://www.latex-project.org/lppl.txt
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This package defines a path generation function for TikZ/PGF
which implements Hobby's algorithm for a path built out of Bezier
curves which passes through a given set of points.

The implementation is in LaTeX3.  It can be used as as a TikZ
`to path`.