title: Black lines missing in the box holding the axes of a MATLAB plot
body: <p>When plotting on a figure in MATLAB, I have noticed that parts of the black box that holds the axes are missing (the left and bottom one):</p>
  <p>              <img src="https://i.stack.imgur.com/mNHJj.png" alt="enter image description here" /></p>
  <p>I have tried issuing:</p>
  <pre><code>box off
  box on
  </code></pre>
  <p>commands with no success. Do you know what I can do to get the corresponding black lines on the axes?</p>
  <h2>Note:</h2>
  <p>I am using the OpenGL renderer:</p>
  <pre><code>set(0,'DefaultFigureRenderer','opengl');
  </code></pre>