Guralp Systems Scream - Manual (Page 45)

User guide
If you do not see the Use in Filter Design… option, check that
only one stream is selected.
3. Leaving the Filter Design window open, switch to the Waveview
window and view the event of interest.
4. Holding down the shift-key ( ), select data from the same
stream during an event. Choose Use in Filter Design… from the
drop-down menu. A dialogue box will open asking you if you
want to replace the previous spectrum or add to it.
Click . The spectrum of the event will be overlaid on the
background noise spectrum, in a lighter shade.
You can now click in the graph to move the filter's corner
frequencies to suit the event.
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