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Overlaying one plot on another

You can overlay one plot on another by clicking on the 'Overlay...' button.  The way this works is the same as 'Get File...', but without first clearing the screen.

When you perform an overlay you will realise that there are generally differences in plot shape according to whether you took readings in a clockwise or anti-clockwise rotation.

It is recommended that for easiest comparison purposes you standardise on saving plots in either the clockwise or anti-clockwise rotation.  You can reverse the displayed rotation of any plot by clicking on the 'Reverse' button and then re-saving.