def multiprocessing_helper(args_kwargs):
    """ Call the models actual fitting function with all needed parameters

    Parameters
    ----------
    args_kwargs : List
        First entry is a reference to the actual fitting function
        Last entry is a dict of keyword arguments
        Entries in between hold positional arguments

    Returns
    -------
    ReconstFit
        Object holding the fitted model parameters
    """
    func = args_kwargs[0]
    args = args_kwargs[1:-1]
    kwargs = args_kwargs[-1]
    return func(*args, **kwargs)
