@classmethod
def add_op2_data(cls, data, comment=''):
    """
        Adds a FORCE2/MOMENT2 card from the OP2

        Parameters
        ----------
        data : List[varies]
            a list of fields defined in OP2 format
        comment : str; default=''
            a comment for the card

        """
    sid = data[0]
    node = data[1]
    mag = data[2]
    g1 = data[3]
    g2 = data[4]
    g3 = data[5]
    g4 = data[6]
    return cls(sid, node, mag, g1, g2, g3, g4, comment=comment)
