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/*! \page fileformats File formats
\tableofcontents
\section FileFormatsPers Persistence Diagram
Such a file, whose extension is usually `.pers`, contains a list of persistence intervals.<br>
Lines starting with `#` are ignored (comments).<br>
Other lines might contain 2, 3 or 4 values (the number of values on each line must be the same for all lines):
\code{.unparsed}
[[field] dimension] birth death
\endcode
Here is a simple sample file:
\code{.unparsed}
# Beautiful persistence diagram
2 2.7 3.7
2 9.6 14.
3 34.2 34.974
4 3. inf
\endcode
Other sample files can be found in the `data/persistence_diagram` folder.
*/
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