Do you simply want to offset the magnatude of the waveform or allow
for time shifting of the waveform as well?  One method I have used is
to offset the waveform and rotate it forward and reverse taking the
maximum value of all three waveforms for the new upper limit.  similar
for lower limit.  If you have multiple "known good" waveforms, take
the maximum values of each waveform as your starting point.

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