title: pyplot zooming in
body: <p>I am trying to plot some data from FITS files and I wanted to know if anyone knows how to focus on certain regions of a plot's axis? Here is some example code:</p>
  
  <pre><code>import pyfits
  from matplotlib import pyplot as plt
  from matplotlib import pylab
  from pylab import *
  #Assuming I have my data in the current directory
  a = pyfits.getdata('fits1.fits')
  x = a['data1'] # Lets assume data1 is the column: [0, 1, 1.3, 1.5, 2, 4, 8]
  y = a['data2'] # And data2 is the column: [0, 0.5, 1, 1.5, 2, 2.5, 3]
  plt.plot(x,y)
  </code></pre>
  
  <p>How could I only plot the region from <code>[1.3 to 4]</code> in the x-axis?</p>