> object containing the solution cost.
It contains the following columns:</p>
<dl><dt>summary</dt>
<dd><p><code>character</code> description of the summary statistic.
The statistic associated with the <code>"overall"</code> value
in this column is calculated using the entire solution
(including all management zones if there are multiple zones).
If multiple management zones are present, then summary statistics
are also provided for each zone separately
(indicated using zone names).</p></dd>


<dt>cost</dt>
<