<h2>Catalogue statistical information</h2>
When hitting the <b>"Apply"</b> button the following data on the edited catalogue are computed from the list of intervals :</br></br>
<ul>
<li>The <b>minimum</b> and <b>maximum</b> durations with corresponding intervals (following the '--' signs)</li></br>
<li>The <b>mean</b>, <b>the standard deviation (St. dev)</b> and the <b>median</b> of interval durations</li><br/>
<li>The <b>density</b> of the catalogue in the global time span : this is the ratio of the sum of all interval durations over the global time span, i.e. the duration of the interval starting with the min 'Start' and finishing with the max 'Stop'.</li>
</ul>
The <b>density</b> is an indication of the occurrence frequency of the event described in a catalogue.