Boltek Lightning/2000 - Manual (Page 206)

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Software Squelch Dialog
Allows you to eliminate the display of strokes or flashes from
the weakest storms.
The value you enter for the cutoff percentage determines
which strokes will be displayed. Entering zero as the cutoff
percentage will allow all strokes to be plotted. Entering 100
as the cutoff percentage will cause only strokes in the
strongest storm at any given moment to be plotted.
By entering an intermediate value, say 20%, strokes that occur
in storms that have a stroke density of less than 20% of the
strongest storm will not be plotted.
The reasons for this dialog are twofold: 1) to get rid of
unnecessary clutter on the real-time lightning display, and 2)
to not plot strokes in low stroke density storms that could
otherwise be ranged inaccurately.
This option applies only to the Real-time Lightning window.