Return a list of stream parameters that have not been associated
    with any of the key dimensions.

def dimensionless_contents(streams, kdims, no_duplicates=True):
    """
    Return a list of stream parameters that have not been associated
    with any of the key dimensions.
    """
    names = stream_parameters(streams, no_duplicates)
    return [name for name in names if name not in kdims]