The following Function keys are used by Screen Ruler:


F7 - Toggle the selection of individual files on or off


When FITS files have been added to the Control window FITS files area, F7 will toggle the selection of individual files on the Ruler, changing the colour of the exposure boundary line for that file. See Adding, selecting and copying FITS files.


F9 - Toggle the ruler Perpendicular line on or off


F12 - Toggle the Magnifier window on or off

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