def METHOD_NAME():
    description = """Reads total mass from mode file."""
    spec = Specification(
        description=description,
        map_input_pin_spec={
            4: PinSpecification(
                name="data_sources",
                type_names=["data_sources"],
                optional=False,
                document="""Data sources (must contain at least one mode
    file).""",
            ),
        },
        map_output_pin_spec={
            0: PinSpecification(
                name="mass",
                type_names=["double"],
                optional=False,
                document="""The unit should be grabbed from the rst file""",
            ),
        },
    )
    return spec