3 ;; to make the coordinates be X,Y,Z do
5 ;; a=surface{[x^2-y^2]}
7 ;; a=surface{[x^2-y^2,x^3+y^3,x]}
8 ;; a=surface{[x^2-y^2,x^3+y^3,x][x=-5,5][y=x:5]}
9 ;; a=tube{[t,t+2,t^3][t=0,10][radius=.3*t]}
10 ;; a=curve{[t,t+2,t^3][t=0,10][style=-1]}
12 ;; a=surface{["foo.zplot"][sample=13,81]}