diff --git a/ch08.r b/ch08.r
index b308eee..c966b9f 100644
--- a/ch08.r
+++ b/ch08.r
@@ -15,6 +15,16 @@ S_grid = mesh$X
 theta_grid = mesh$Y
 L = S_grid * log(theta_grid) + (N-S_grid) * log(1-theta_grid)
 L = t(L)
-persp3D(S, theta, L, theta=65, phi=15)
+persp3D(S, theta, L, theta=65, phi=15, border="black", lwd=0.3, bty="b2", xlab="S", ylab="θ", zlab="", ticktype="detailed")
+
+N = 50
+S = seq(from=1, to=N, by=0.1)
+theta = seq(0.1, 0.9, (0.1+0.9)/1000)
+mesh = meshgrid(S, theta)
+S_grid = mesh$X
+theta_grid = mesh$Y
+L = S_grid * log(theta_grid) + (N-S_grid) * log(1-theta_grid)
+L = t(L)
+image(S, theta, L, col=rainbow(256), ylim=c(0.9, 0.1))
 
 #############