+import jalview.analysis.scoremodels.ScoreModels;
+import jalview.api.AlignViewportI;
+import jalview.api.analysis.ScoreModelI;
+import jalview.api.analysis.SimilarityParamsI;
+import jalview.bin.Cache;
+import jalview.datamodel.Alignment;
+import jalview.datamodel.AlignmentI;
+import jalview.datamodel.AlignmentView;
+import jalview.datamodel.HiddenColumns;
+import jalview.datamodel.SequenceI;
+import jalview.gui.ImageExporter.ImageWriterI;
+import jalview.gui.JalviewColourChooser.ColourChooserListener;
+import jalview.jbgui.GPCAPanel;
+import jalview.math.RotatableMatrix.Axis;
+import jalview.util.ImageMaker;
+import jalview.util.MessageManager;
+import jalview.viewmodel.AlignmentViewport;
+import jalview.viewmodel.PCAModel;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.print.PageFormat;
+import java.awt.print.Printable;
+import java.awt.print.PrinterException;
+import java.awt.print.PrinterJob;
+
+import javax.swing.ButtonGroup;
+import javax.swing.JMenuItem;
+import javax.swing.JRadioButtonMenuItem;
+import javax.swing.event.InternalFrameAdapter;
+import javax.swing.event.InternalFrameEvent;