9.273 - 21.85 \eta + 3.373 \chi_+ + 14.03 \eta^2 + 7.836 \eta \chi_+ - 3.304 \eta \chi_- + 3.543 \chi_+^2 + 3.424 \chi_+ \chi_- - 22.07 \eta^2 \chi_+ + 15.32 \eta^2 \chi_- - 11.25 \eta \chi_+ \chi_- + 4.089 \eta \chi_-^2 + 2.102 \chi_+^3 + 1.508 \chi_+ \chi_-^2