</a></h2>
    <dl><dt>x</dt>
<dd><p>zoo, data.frame or matrix object, with sub-hourly time series. <br>
Measurements at several gauging stations can be stored in a data.frame or matrix object, and in that case, each column of <code>x</code> represent the time series measured in each gauging station, and the column names of <code>x</code> represent the ID of each station.</p></dd>

  <dt>FUN</dt>
<dd><p>Function that have to be applied for transforming from sub-hourly to hourly time step. (e.g., for precipit