cleanF13 := (-2+2*x^5-5*x^4*y+x^4+2*x^3*y^2-5*x^3*y-2*x^3-2*x^2*y^3-4*x^2*y^2+
2*x^2*y-2*x*y^4-2*x*y^3+5*x*y^2-3*x*y+4*x-3*y^5+5*y^4-y^3+3*y^2+5*y)*(-4+3*x^4
*y+3*x^4-3*x^3*y^2-2*x^3*y+5*x^3+4*x^2*y^3-2*x^2*y^2+4*x^2*y+x^2-x*y^4-5*x*y^3
-3*x*y^2+x*y+4*y^5-5*y^4-5*y^3+2*y^2-3*y)^2;
noiseF13 := `*`(1/6239188477050000*1917871^(1/2)*124783769541^(1/2),-54621*x^
11*y^2-13372*y^6+7909*x*y^14-15083*x*y^12+7615*x^6+92229*x^3*y^4+98767*x^4*y^4
-44194*x^5*y^2+79473*x^7*y^4+99972*x^8*y-67399*y^8+55594*x^10*y+79860*y^10+
66355*x*y^7+55850*x*y^6-48277*y^9+8158*x^2*y^12-4134*x^8*y^4-44785*x^5*y^10-\
96634*x^4*y^2-30317*x^14-87345*x^2*y^4-6468*x^3*y+46920*x^9*y^4+77465*x^5-3512
*y^8*x^3+85245*x^6*y^9-23898*x^4+86590*y^2+54478*x^12*y-65023*x^7*y^7+41408*x^
7*y^8+24156*x^11+88449*x^7*y^5);