title: Change Color of Dygraphs Series Partway Through
body: <p>In my dygraphs chart, I have a series which has been extrapolated.  I would like to color the extrapolated parts differently, but have not found a way to do that.</p>
  
  <p>I suspect a way does not exist (since what I found in the documentation suggests color is per-series only), but in case there is a way, <strong>how can I change the color of a data series partway through?</strong></p>