title: Axis label re-centering in matplotlib
body: <p>I am plotting specific slices of a [700,700] numpy array. I am doing <code>plt.plot(data_array[:,350])</code>, since I need to see the variation of the X values for the mid value of Y-axis. It looks like the following <a href="https://i.stack.imgur.com/nkmnP.png" rel="nofollow noreferrer">figure</a></p>
  <p>As is seen, the centre where the value of Y-axis peaks is 350. However, if I want to label the x axis in such a way that the value is 0 at the peak with -350 and +350 on either side of it, is there a way this kind of labelling can be done?</p>