ions.</p></dd>


<dt>timestamps_label</dt>
<dd><p>an optional character string specifying the core of
the column labels containing the timestamps. If no timestamps are found in
the data, a timestamps variable with increasing integers will be created
(assuming equidistant time steps).</p></dd>


<dt>add_labels</dt>
<dd><p>a character vector specifying the core of columns
containing additional mouse-tracking variables.</p></dd>


<dt>mt_id_label</dt>
<dd><p>an optional character string (or vector) specifying 