def METHOD_NAME(fname,sym='X',expo=None):
    if os.path.exists(fname):
        base_gto = open(fname,"r").read()
        if expo is None:
            return base_gto
    else:
        base_gto = ''
    assert( len(expo) > 0 )
    assert( len(expo) <= 7 )
    lname = numpy.array(['S','P','D','F','G','H','I'])
    for i in range(len(expo)):
        base_gto += sym + "   " + lname[i] + " \n  {}  1.00\n".format(expo[i])
    return base_gto