fixing legend anomaly

src/i0mmonplot.cpp

@@ -114,6 +114,7 @@ void I0MMonPlot::setSources(const QString &x, const QString &y, const QMap<int,
         }
     }
     updateLegend();
+    printf("I0MMonPlot::setSources curvesSize %d\n", curves().size());
 }
 
 void I0MMonPlot::setYBounds(double ymi, double yma) {