g1(x,y)=1-1.27700*x^2+0.08729*x^4+0.00628*x^6-0.00077*x^8+ 0.00002*x^10-0.49955*y+0.13906*(x^2)*y+0.00422*(x^4)*y- 0.00178*(x^6)*y+0.00012*(x^8)*y+0.04634*y^2- 0.00148*(x^2)*y^2-0.00142*(x^4)*y^2+0.00018*(x^6)*y^2- 0.00108*y^3-0.00045*(x^2)*y^3+0.00012*(x^4)*y^3- 0.00001*(x^6)*y^3-0.00004*y^4+0.00004*(x^2)*y^4- 0.00001*(x^4)*y^4 f1(x,y)=1-2.32102*x^2+0.39699*x^4+0.0017*x^6-0.00489*x^8+ 0.00043*x^10+0.22671*y+0.50507*(x^2)*y-0.03003*(x^4)*y- 0.00829*(x^6)*y+0.00144*(x^8)*y-0.00003*(x^10)*y- 0.00001*(x^12)*y+0.14401*y^2-0.03241*(x^2)*y^2- 0.00414*(x^4)*y^2+0.00173*(x^6)*y^2-0.00012*(x^8)*y^2- 0.00001*(x^10)*y^2-0.00869*y^3-0.00035*(x^2)*y^3+ 0.00096*(x^4)*y^3-0.00014*(x^6)*y^3+0.00014*y^4+ 0.00024*(x^2)*y^4-0.00008*(x^4)*y^4+0.00002*y^5- 0.00002*(x^2)*y^5