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  #! /bin/sh                                                                [1]
  # Plot band-pass filtered and gained traces.
  # Usage:  Plot data_file
  
  # set parameters
  frequency=4,8,42,54                                                       [2]
  gain=2.0
  
  sufilter f=$frequency <$1 |                                               [3]
  sugain tpow=$gain | 
  suxwigb \                                                                 [4]
      label1="Time (s)" label2="Distance (m)" \
      title="Band-pass filtered and gained traces." &
  exit

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  % chmod +x plot
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  % ./plot data1

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