def add_wire_length_args(parser):
    """Add arguments for specifying sets of wire lengths available for a given
	system."""
    wire_length_group = parser.add_argument_group('available wire lengths')
    wire_length_group.add_argument('--wire-length', '-l', type=float,
        metavar='L', action='append', nargs='+', help=
        'specify one or more available wire lengths in meters')
    wire_length_group.add_argument('--minimum-slack', type=float, metavar=
        'H', default=0.05, help=
        'the minimum slack to allow in a wire connecting two boards in meters')
