First row left to right:

f(x,y)=(cos(x)+3)*(sin(y)+3) levels 1-4, f(x,y)=(cos(x/pi)+2)*(cos(x/pi)+2) levels 1-4,

f(x,y)=(x^2)*(y^2) levels 7-8,

Second row left to right:

f(x,y)=(log(x))*(log(y)) levels 1-2,

f(x,y)=(x^4)+(y^4) levels 6-9,

f(x,y)=(x^2)+(y^2) levels 6-9

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