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question for measuring roll-off

Dear List,

I am trying to measure the roll-off (in dB/octave) for a bandstop.  It
appears that the roll-off is symmetrical in terms of Hz (and thus
asymmetrical in terms of octaves) and I was wondering if the convention is
to report the roll-off above the bandstop, below it, or some average of
the two.

Justin Aronoff