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    <p>Based on code in the <a href="https://r-forge.r-project.org/scm/viewvc.php/pkg/R/TA.R?view=markup&amp;root=quantmod" rel="nofollow noreferrer">TA.R</a> file of the <a href="http://cran.r-project.org/package=quantmod" rel="nofollow noreferrer">quantmod</a> package, here is code that uses <code>rle</code> to find the starts and ends of the rectangles.</p> <pre><code>runs &lt;- rle(as.logical(spy[, 1] &gt; spy[, 2])) l &lt;- list(start=cumsum(runs$length)[which(runs$values)] - runs$length[which(runs$values)] + 1, end=cumsum(runs$lengths)[which(runs$values)]) rect &lt;- data.frame(xmin=l$start, xmax=l$end, ymin=-Inf, ymax=Inf) </code></pre> <p>Combine that with some <code>ggplot2</code> code from the <a href="https://stackoverflow.com/a/4733446/967840">accepted answer</a> to the question you linked to:</p> <pre><code>ggplot(spy,aes(x=index(spy),y=spy$SPY.Adjusted))+geom_line()+geom_line(aes(x=index(spy),y=spy$sma))+geom_rect(data=rect, aes(xmin=xmin, xmax=xmax, ymin=ymin, ymax=ymax), color="grey20", alpha=0.5, inherit.aes = FALSE) </code></pre> <p>And you get:</p> <p><img src="https://i.stack.imgur.com/cdRGP.png" alt="enter image description here"></p> <p>If you reverse the order of plotting and use <code>alpha=1</code> in <code>geom_rect</code> it may (or may not) look more like you desire:</p> <pre><code>ggplot(spy,aes(x=index(spy),y=spy$SPY.Adjusted))+geom_rect(data=rect, aes(xmin=xmin, xmax=xmax, ymin=ymin, ymax=ymax), border=NA, color="grey20", alpha=1, inherit.aes = FALSE)+geom_line()+geom_line(aes(x=index(spy),y=spy$sma)) </code></pre> <p><img src="https://i.stack.imgur.com/1g7is.png" alt="enter image description here"></p> <hr> <p>Since you have an <code>xts</code> object. You may not even want to convert to a <code>data.frame</code>. Here is how you could plot it using the brand new <code>plot.xts</code> method in the <a href="https://r-forge.r-project.org/scm/viewvc.php/pkg/xtsExtra/?root=xts" rel="nofollow noreferrer">xtsExtra</a> package created by Michael Weylandt as part of a Google Summer of Code <a href="http://rwiki.sciviews.org/doku.php?id=developers:projects:gsoc2012:xts" rel="nofollow noreferrer">project.</a></p> <pre><code>spy &lt;- as.xts(spy) require(xtsExtra) plot(spy, screens=1, blocks=list(start.time=paste(index(spy)[l$start]), end.time=paste(index(spy)[l$end]), col='lightblue'), legend.loc='bottomright', auto.legend=TRUE) </code></pre> <p><img src="https://i.stack.imgur.com/GFY76.png" alt="enter image description here"></p>
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    1. CO+1 that's hot. Michael sure did some great work!
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