title: Highlighting specific ranges on a Graph in R
body: <pre><code>library(season)
  plot(CVD$yrmon, CVD$cvd, type = 'o',pch = 19,ylab = 'Number of CVD deaths per month',xlab = 'Time')
  </code></pre>
  
  <p>if i wanted to highlight a region of the graph based on x values say from 1994-1998 how do i do this?</p>
  
  <p>Any thought would be appreciated 
  Thanks.</p>