title: How to group lines in a Bokeh table?
body: <p>To create a Bokeh table with <em>selectable</em> lines, I'm using this <a href="https://github.com/bokeh/bokeh/wiki/Filterable-Data-Source" rel="nofollow noreferrer">example</a>.
  The issue is that my data is represented as groups of different lines that looks like this:</p>
  
  <p><a href="https://i.stack.imgur.com/rvsGL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rvsGL.png" alt="enter image description here"></a> </p>
  
  <p>Any idea how it can be done in Bokeh?</p>