zone 2 2
fun2 10 abs(sin(x)/x)*(cos(y)*y) 40 -6 6 40 -6 6
contour 10 40 0
hi/de 10
fun2 10 x*sin(x)*y*sin(y) 40 -10. 10. 40 -10. 10. c
h/pl 10 surf4