title: matplotlib: make plus sign thicker
body: <p>In Matplotlib, I would like to draw a <strong>thick plus sign</strong> (or a cross), but the one provided in the <a href="http://www.loria.fr/~rougier/teaching/matplotlib/#markers">marker set</a> is too <strong>thin</strong>.</p>
  
  <p>Even as I increase its size, it doesn't get any thicker.</p>
  
  <p>For <a href="http://statsmodels.sourceforge.net/devel/generated/statsmodels.graphics.boxplots.beanplot.html">example</a>:
  <img src="https://i.stack.imgur.com/U1FQw.png" alt="enter image description here">
  The <a href="http://statsmodels.sourceforge.net/devel/_modules/statsmodels/graphics/boxplots.html">lines of code</a> drawing the red plus sign are:</p>
  
  <pre><code># Draw median marker.
  if plot_opts.get('bean_show_median', True):
      ax.plot(pos, np.median(pos_data),
              marker=plot_opts.get('bean_median_marker', '+'),
              color=plot_opts.get('bean_median_color', 'r'))
  </code></pre>
  
  <p>If I add an extra parameter <code>markersize=20</code>, the marker will only stretch. It will be as thin as before. Can I make it thick?</p>