[Matplotlib-users] Values returned by axis() do not match the actual axis in the plot window

Hello,

I have matplotlib widget set up in a PyQt 4 program.  The axis is set for
auto scaling.  I'm using the following command to determine the upper y
boundary:

self.plotWidget.canvas.ax.axis()[3]

where plotWidget is the name of the widget in my program.  I get a number
from this command just fine, but it doesn't always agree with the actual
axis on the plot window.  For instance, after plotting a curve with a
maximum y-value of 0.125, the command above gives me an upper y-limit of
0.14.  However, the plot window goes up to y=0.16.  Sometimes things work
out correctly, but they call above and the plot window do not typically
agree.  

I really need the plot window to match what comes from this call to axis(). 
Can anyone offer any suggestions on what might be going wrong?

Thanks,
Steve
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