title: issues plotting multivariate time series in R
body: <p>I have a time-series of 10 objects measured along 12 hours to monitor a specific variable. The time-series is stored in a data frame like this:</p>
  
  <pre><code>&gt; myTS
      hr1  hr2  hr3  hr4  hr5  hr6  hr7  hr8  hr9 hr10 hr11 hr12
  1    43  108   71   64  112   46  115  375  187  163   55  190
  2   153  123  110  141  107  139  105  137  126  277  316   48
  3   159   65   65   69   70   73   65   66   65   66  139   90
  4   310  300  256  251   25  208  219  180   63  134  454  351
  5   183  225   20  313  245   30  267  345  279  330  36    88
  </code></pre>
  
  <p>I'm trying to plot these on a single plot window with the time on the x axis and values on the y axis for each of the 5 objects, and differentiate the 5 lines using different colors. I have tried the <code>plot.ts()</code> function but it gives an error saying:</p>
  
  <pre><code>Error in plotts(x = x, y = y, plot.type = plot.type, xy.labels = xy.labels,  : 
  cannot plot more than 10 series as "multiple"
  </code></pre>
  
  <p>Then I tried the <code>lines()</code> function but still doesn't work. Any help please??!!</p>