<code>x</code> have to correspond to the ID of each station (starting by a letter). When <code>x</code> is a matrix or data.frame, the flow duration curve is computed for each column.</p></dd>

  <dt>lband</dt>
<dd><p>numeric, zoo, data.frame or matrix object with the streamflows representing the the lower uncertainty bound of <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>lband</