title: How do you change size of labels in the Bokeh legend in python?
body: <p>I have several curves (of different colours) plotted in the same figure and would like to widen the corresponding coloured lines in the legend so that they are easier to differentiate when projected onto a large screen.</p>
  
  <p>I can access the properties of the legend fine, for example the legend's label text font size with:</p>
  
  <pre><code>p1.legend.label_text_font_size = "15pt"
  </code></pre>
  
  <p>where <code>p1</code> is the figure in question. The problem is I don't know what the term for the "coloured lines" in the legend is and sadly the <a href="http://bokeh.pydata.org/en/latest/docs/user_guide/objects.html#legends" rel="noreferrer">relevant section</a> in the docs is empty.</p>