duplicated colorbar

hi, I am plotting two figures in a row and I am getting a duplicated colorbar
in the second figure:

imshow(stats[0])
title('Distance Matrix')
colorbar()
savefig('dm.png')
imshow(stats[12])
colorbar()
title('Conectivity Matrix')
savefig('cm.png')

I tried omitting the second colorbar() command. Then I get a single colorbar
in the second figure but with same scale of figure 1.

What am I doing wrong?

Flávio