153.6 - 6463 \eta + 114700 \eta^2 - 1053000 \eta^3 + 5278000 \eta^4 + 478.4 \eta^3 \chi_+ - 13680000 \eta^5 - 1960 \eta^4 \chi_+ + 65.4 \eta^4 \chi_- + 14320000 \eta^6