PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command:
data grid --help

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This function overlay grid on graph plot window.
use zero value to turn off either

usage:
    data grid [-h] [-x <dec>] [-y <dec>]

options:
    -h, --help                     This help
    -x <dec>                       plot grid X coord
    -y <dec>                       plot grid Y coord

examples/notes:
    data grid                      -> turn off
    data grid -x 64 -y 50