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#### A.4.8.1 Histogram Navigation

For general comments on plot navigation, see Appendix A.4.2.1. Additional configuration options are available in the Navigation tab of the Axes control.

The navigation actions for this window are:

Left drag
  Pan. On the body of the plot this moves it around up/down/left/right. To move it only vertically, drag on the left of the Y axis. To move it only horizontally, drag below the X axis. You can configure dragging on the body of the plot to be only vertical or horizontal by setting the Pan/Zoom Axes in the Navigation axis configuration tab.
Right drag (CTRL-drag)
  Stretch zoom. On the body of the plot, dragging up/down stretches/squashes the plot vertically, and dragging left/right stretches/squashes it horizontally. To zoom only vertically, drag on the left of the Y axis. To zoom only horizontally, drag below the X axis.

  Zooming horizontally will normally adjust the width of the histogram bars appropriately.

  Normally, the zoom will be centered horizontally at the mouse position and vertically on the X axis, so the zoom will not move the bottom of the histogram. You can adjust that with the Anchor X/Y Axis options in the Navigation axis configuration tab.

Wheel
  Isotropic zoom. Spinning the mouse wheel forwards/backwards will zoom in/out just like dragging with the right button up-and-right or down-and-left.

You can also manually fix the plot bounds using the Range tab of the Axes control.

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk