def METHOD_NAME(self, index):
    """
    Set the ROI via an index (as opposed to via coordinates). Legacy code
    for old Andor NEO cameras which only supported certain fixed ROIs.
    Should not be essential / can remove.
    Parameters
    ----------
    index : int
        Index of top left coordinate in image. Width/height automatically
        determined prior to function use by chopping image into ROIs of
        desired size.
    Returns
    -------
    None
    See Also
    --------
    SetROI
    """
    raise NotImplementedError('Implemented in derived class.'