How can I force matplotlib to not "merge" y-axis labels?  For example, if I've got y-axis ticks at 1, 1.01, 1.02, etc.,  matplotlib likes to show 0, 0.01, 0.02 with a +1 in the upper left corner.  An example showing this behavior underlined in red is below:

How can I disable this behavior? I don't know what it's called, so I don't know what to Google to shut it off.