<dt>sim</dt>
<dd><p>OPTIONAL. <br>
numeric, zoo, data.frame or matrix object with the streamflows simulated for <code>x</code>, for which the flow duration curve have to be computed. <br>
Measurements at several gauging stations can be stored in a data.frame of matrix object. When <code>sim</code> is a matrix or data.frame, the flow duration curve is computed for each column.</p></dd>

<dt>lQ.thr</dt>
<dd><p>numeric, low flows separation threshold. If this value is different from 'NA', a vertical line is dr