title: R/quantmod: multiple charts all using the same y-axis
body: <p>I'm trying to plot 6 days of intraday data as 6 charts. Quantmod's experimental chart_Series() function works with par() settings. I've pre-loaded the data into <code>bars</code> (a vector of XTS objects) so my code looks like this:</p>
  
  <pre><code>par(mfrow=c(3,2))   #3 rows, 2 columns
  
  for(d in bars){
      print(chart_Series(d, type = "candlesticks") )
      }
  </code></pre>
  
  <p>This works, but each chart has its own different y-axis scale. I wanted to set a y-range that covers all 6 days, but cannot find a way to do this. I tried this:</p>
  
  <pre><code>ylim=c(18000,20000)
  print(chart_Series(d, type = "candlesticks",ylim=ylim) )
  </code></pre>
  
  <p>but it fails with the "unused argument(s)" error. yrange=ylim also fails.</p>
  
  <p>I can use chartSeries(d,yrange=ylim), and it works. But as far as I know I cannot put multiple charts in one display (?).
  (It might strictly be off-subject, but suggestions for alternative R packages that can draw nice-looking candlestick charts, allow y-axis control and can draw multiple charts on one image would also be very welcome.)</p>