def iid_nuisance_parameters(shape='gaussian', param0=0.0, param1=1.0):
    """
    Utility function to be used as input to various SampleAugmenter functions, specifying that nuisance parameters are
    fixed at their nominal valuees.

    Parameters
    ----------
    shape : ["flat", "gaussian"], optional
        Parameter prior shape. Default value: "gaussian".

    param0 : float, optional
        Gaussian mean or flat lower bound. Default value: 0.0.

    param1 : float, optional
        Gaussian std or flat upper bound. Default value: 1.0.

    Returns
    -------
    output : tuple
        Input to various SampleAugmenter functions.

    """
    return 'iid', (shape, param0, param1)
