An .area file associates with each triangle a maximum area that is used
for mesh refinement.
As with other file formats, every triangle must
be represented, and they must be numbered consecutively (from one or zero).
Blank lines and comments prefixed by `#' may be placed anywhere.
A triangle may be left unconstrained by assigning it a negative maximum
- First line: <# of triangles>
- Following lines: <triangle #> <maximum area>
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