<map id="QwtPlotHistogram" name="QwtPlotHistogram"><area shape="rect" id="node2" href="$class_qwt_plot_series_item.html" title="Base class for plot items representing a series of samples. " alt="" coords="5,87,137,114"/><area shape="rect" id="node3" href="$class_qwt_plot_item.html" title="Base class for items on the plot canvas. " alt="" coords="25,5,118,32"/><area shape="rect" id="node4" href="$class_qwt_abstract_series_store.html" title="Bridge between QwtSeriesStore and QwtPlotSeriesItem. " alt="" coords="160,5,324,32"/><area shape="rect" id="node5" href="$class_qwt_series_store.html" title="QwtSeriesStore\< QwtInterval\lSample \>" alt="" coords="162,80,357,121"/></map>