title: Matplotlib yaxis range display using absolute values rather than offset values?
body: <p>I have the following range of numpy data (deltas of usec timestamps):</p>
  
  <pre><code>array([ 4.312,  4.317,  4.316,  4.32 ,  4.316,  4.316,  4.319,  4.317,
      4.317,  4.316,  4.318,  4.316,  4.318,  4.316,  4.318,  4.317,
      4.317,  4.317,  4.316,  4.317,  4.318,  4.316,  4.318,  4.316,
      4.318,  4.316,  4.317,  4.317,  4.318,  4.316,  4.317,  4.317,
      4.317,  4.317,  4.317,  4.316,  4.319,  4.315,  4.319,  4.315,
      4.319,  4.315,  4.316,  4.319,  4.317,  4.317,  4.317,  4.318,
      4.315,  4.317,  4.317,  4.317,  4.319,  4.314,  4.32 ,  4.315,
      4.317,  4.318,  4.315,  4.318,  4.317,  4.317,  4.317,  4.316,
      4.317,  4.318,  4.317,  4.317,  4.317,  4.315,  4.319,  4.317,
      4.315,  4.319,  4.316,  4.318,  4.318,  4.315,  4.318,  4.317,
      4.317,  4.321])
  </code></pre>
  
  <p>When I plot with matplotlib.pyplot:</p>
  
  <pre><code> import matplotlib.pyplot as plt
   plt.plot( deltas ) 
   plt.show()
  </code></pre>
  
  <p>I get the following plot. Why is the Y-axis being scaled that way? How can I get the Y-axis to be labeled as the data, not an offset of the data?  Sometimes the plot is the "+4.nnn" sometimes it isn't (depending on the data range?).</p>
  
  <p>Plotted "strangely":<br />
  <img src="https://i.imgur.com/6tvKb.png" alt="Plotted Badly"></p>
  
  <p>Plotted "correctly":<br />
  <img src="https://i.imgur.com/FwUiI.png" alt="Plotted Correctly"></p>