es include both positive and negative
infinity and “Not-a-Number” which are represented as
the strings <code>NaN</code>, <code>inf</code>, <code>+inf</code>, <code>-inf</code>.
All other values are written in decimal notation with
at most 6 digits of precision.</p>
<p>Stan CSV files have a header row containing the column names.
They also make extensive use of CSV comments,
i.e., lines which begin with the <code>#</code> character.
In addition to initial and final comment rows,
some methods also put com