PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command:
data decimate --help

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Performs decimation, by reducing samples N times in the grapbuf. Good for PSK

usage:
    data decimate [-h] [-n <dec>]

options:
    -h, --help                     This help
    -n <dec>                       factor to reduce sample set (default 2)

examples/notes:
    data decimate                 
    data decimate -n 4