title: Overlay of multiple time series in Quantmod in R
body: <p>I want to create a chart using chartSeries with two or more time series on the SAME chart (overlaying each other). Bing/search doc have gotten me nowhere. Seems like should be fairly easy, I tried addTA, but didn't work. I tried the following code.</p>
  
  <pre><code>chartSeries(c(PSEC, ARCC), type = "line")
  </code></pre>
  
  <p>That resulted into this: (nevermind the fonts, the hell is the green blob?)</p>
  
  <p><img src="https://i.stack.imgur.com/mf22j.png" alt="enter image description here"></p>