6.4 - 296.5 \eta^3 - 56.71 \eta^2 \chi_- + 2.317 \eta \chi_+^2 - 4.757 \chi_-^3 - 353.7 \eta^2 \chi_-^2 - 41.22 \eta \chi_+ \chi_-^2 + 120.1 \eta \chi_-^3 + 4959 \eta^3 \chi_-^2 - 15780 \eta^4 \chi_-^2 + 131.9 \eta \chi_+ \chi_-^4 - 143.8 \eta \chi_-^5