+import jalview.datamodel.Alignment;
+import jalview.datamodel.AlignmentView;
+import jalview.datamodel.ColumnSelection;
+import jalview.datamodel.SeqCigar;
+import jalview.datamodel.SequenceI;
+import jalview.jbgui.GPCAPanel;
+import jalview.schemes.ResidueProperties;
+import jalview.util.MessageManager;
+import jalview.viewmodel.AlignmentViewport;
+import jalview.viewmodel.PCAModel;
+