@classmethod
def sload(cls, filename):
    """
        A static method combining the constructor and the loader from
        a file

        :param filename: name of the file to load
        :type filename: string
        :return: instance of Gerometry of AzimuthalIntegrator set-up with the parameter from the file.
        """
    inst = cls()
    inst.load(filename)
    return inst
