If you take a close look at this chart, you will notice that grid lines are above the columns - equally dividing them into segments. This is an optional feature, of course. It allows you creating the charts close to the ones described by famous data visualization guru, <a href="http://www.edwardtufte.com/">Edward Tufte</a>, in his book "The Visual Display of Quantitative Information".
<h2>From columns to bars - one simple step</h2>
Click EDIT button on top of the chart, and add this text to the source (anywhere within curly brackets): <strong>"rotate":true,</strong>. Run the script and... The columns should became bars, category axis should be vertical now and value axis - horizontal! This is the only property you change to make this trick. All our Serial charts can be rotated in the same way.