Thread Subject: Disappearing contour labels

Hi all you cyber Matlabers,

I have a question. I'm trying to generate a plot that has a colored scalar field with vectors and contours over it. I'm using the pcolor and contour functions. The plot is coming out fine, but my contour labels are not showing up, even when I try using the 'manual' option. Here's my code:

[X,Y]=meshgrid(0:0.5:50,0:0.5:12);

%Specify the values w will be contoured at
ContPos=[0;5;10;20];
ContNeg=[-20;-10;-5];

figure(1)
pcolor(X,Y,Reflectivity1)
shading flat
caxis([0, 55])
colorbar
xlabel('Y km (N/S) 1 grid point = 500 m')
ylabel('Height 1 grid point =500 m')
title('Vertical x-section: Reflectivity with vertical velocity contours')
hold on
quiver(X(1:25,1:4:101),Y(1:25,1:4:101),UY1(1:25,1:4:101),WY1(1:25,1:4:101), 2, 'k')
[C1,h1]=contour(X,Y,WY1,ContPos,'k');
clabel(C1,h1,'LabelSpacing',288);
[C2,h2]=contour(X,Y,WY1,ContNeg,'--k');
clabel(C2,h2,'LabelSpacing',288);
hold off;

Any ideas? Thanks so much!