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    <div class="ref-description section level2">
    <p>This function generates boxplots of the hydrograph separation variables produced by <code><a href="gr_summarize.html">gr_summarize()</a></code>. The data for each variable is divided into two samples: before and after the change year either set by <code>year</code> parameter or extracted from <code>tests</code> (statistically estimated). Different background fill colors are used to differentiate seasons types.</p>
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