When you are viewing a time interval that is longer than one second per screen
pixel, the program must sub-sample the data. Every second the screen is
redrawn with a new set of samples. Also the plots are rescaled according to
the data being plotted (if auto-scaling is turned on). With very noisy data,
like the raw oscillator plot, you see the effects of what amounts to a new
data set every second. Turning on display filtering (F D command) helps
smooth out the changes (but can hide very short disturbances).
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