def METHOD_NAME(
        freq, instrument_response, instr_type='lemi'):
    """
    interpolate instrument-response style files.
    Wrapper for different calls, varying by type.
    Current state: only LEMI-coils implemented
    """
    if instr_type.lower() == 'lemi':
        return interpolate_lemi_coils_response(freq, instrument_response)
    else:
        print('\n\tERROR - instrument type', instr_type, ' not implemented yet\n')
        sys.exit()