code: def arg_qxform(cls, parser):
          
          group = parser.add_argument_group('Q-transform options')
          group.add_argument('--plot', nargs='+', type=float, default=[.5],
                             help='One or more times to plot')
          group.add_argument('--frange', nargs=2, type=float,
                             help='Frequency range to plot')
          group.add_argument('--qrange', nargs=2, type=float,
                             help='Search Q range')
  
          group.add_argument('--nowhiten', action='store_true',
                             help='do not whiten input before transform')
docs: Add an `~argparse.ArgumentGroup` for Q-transform options