
    </tr>
    <tr>
      <th>tsobs</th>
      <td><p>data.frame with column <em>t</em> containing the user-specified times for 
which drawdown at the observation well or piezometer will be calculated.
If the data.frame has no rows, no drawdowns are calculated for the 
observation well or piezometer. The data.frame can (optionally) contain 
the measured drawdown for the observation well or piezometer at the 
corresponding times in an additional column <em>dd</em>.</p></td>
    </tr>
    <tr>
      <th>irun<