How to specify values on a colorbar?

I am having trouble getting the appropriate values to show up on my colorbar. The values I need to show are in a 1x11 vector called levels that vary in their values depending on the day. This is the figure as it is now:

These are the values in the levels vector.

 levels = [ 0.0723    0.1736    0.4167    1.0000    2.4000    5.7600   13.8240   33.1776  79.6262  191.1030  458.6471]