Waterfall
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The Waterfall group sets the Low Level and High Level at which the waterfall display changes, or stops changing, colour. These can be set per band and are saved. Similar to the panadapter display, by hovering the mouse cursor over the Peak button the mouse wheel can raise and lower the waterfall thresholds in unison or, with the Ctrl key, increase/decrease the range.
 
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Averaging Time selects how long the signal is sampled for the display. Shorter times will begin to show more signal detail but brief noise pulses in the waterfall will begin to appear.
Update Period is the time taken for each 'step' in the flow of the waterfall.

For the range of Waterfall palettes available see the Colours/Display tab.