def nc_curve(nc):
    """Return an array containing the `nc` curve.

    Parameter:

    nc: `int` between 15 and 70 with step of 5. Valid values are: 15, 20, 25,
    ..., 60, 65 and 70. Invalid values (e.g. 23) returns `None`.
    """
    try:
        return NC_CURVES[nc]
    except __HOLE__:
        return None
dataset/ETHPy150Open python-acoustics/python-acoustics/acoustics/criterion.py/nc_curve