Ok - I think I have an answer to my own question.
This seems to be doing the trick:
c1 = 2*rand(5,5);
c2 = 2*rand(5,5) + 1;
figure;
imagesc(c1);
caxis([0 3]);
colorbar;
figure;
imagesc(c2);
caxis([0 3]);
colorbar;
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