g(x,y)=1-1.09789*x^2+0.15708*x^4-0.01760*x^6-
0.00656*x^8+0.00223*x^10-0.71142*x*y+0.08649*(x^3)*y+
0.04397*(x^5)*y-0.01794*(x^7)*y+0.00349*(x^9)*y+
0.00177*(x^2)*y^2+0.03788*(x^4)*y^2-0.01465*(x^6)*y^2+
0.00381*(x^8)*y^2-0.00062*(x^10)*y^2+0.00715*(x^3)*y^3-
0.00373*(x^5)*y^3+0.00066*(x^7)*y^3-0.00007*(x^9)*y^3-
0.00034*(x^4)*y^4-0.00003*(x^6)*y^4+0.00005*(x^8)*y^4-
0.00001*(x^10)*y^4-0.00002*(x^5)*y^5+0.00002*(x^7)*y^5-
0.00001*(x^9)*y^5

f(x,y)=1+0.06696*x^2+1.54157*x^4-1.06106*x^6+
0.19682*x^8-0.01239*x^10-2.79602*x*y+
1.36187*(x^3)*y-0.81578*(x^5)*y+0.17873*(x^7)*y-
0.00300*(x^9)*y+0.21012*(x^2)*y^2-0.15760*(x^4)*y^2-
0.01068*(x^6)*y^2+0.06894*(x^8)*y^2-0.02013*(x^10)*y^2-
0.00452*(x^3)*y^3-0.01900*(x^5)*y^3+0.03524*(x^7)*y^3-
0.01132*(x^9)*y^3-0.00502*(x^4)*y^4+0.01271*(x^6)*y^4-
0.00757*(x^8)*y^4+0.00132*(x^10)*y^4+0.00170*(x^5)*y^5-
0.00178*(x^7)*y^7+0.00046*(x^9)*y^5-0.00018*(x^6)*y^6+
0.00006*(x^8)*y^6+0.00001*(x^10)*y^6+0.00003*(x^7)*y^7-
0.00001*(x^9)*y^7