- 0.431 + 21.23 \eta + 0.2405 \chi_+ + 0.1427 \chi_- - 175.8 \eta^2 - 2.017 \eta \chi_+ + 0.03273 \chi_+^2 + 0.2473 \chi_-^2 + 414.9 \eta^3 - 1.526 \eta \chi_-^2 + 0.6688 \chi_+^3 - 1.876 \chi_+^2 \chi_- + 1.815 \chi_+ \chi_-^2 - 0.4803 \chi_-^3
equal mass adjustment:
0.04064 |\chi_-|