title: How to create a ggplot bar chart with multiple columns of data for y?
body: <p>My dataset looks like this :</p>
  <p><a href="https://i.stack.imgur.com/uMoBG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uMoBG.png" alt="Here's a sample of the dataset. Just want to plot the columns marked in yellow" /></a></p>
  <p>Here's a table with a sample of the data:
  | City    | AverageClientUsage | AverageClientEst | EstimatedTraffic |
  |---------|--------------------|------------------|------------------|
  |Atlanta  |2695.68             |3555.62           |2812.89           |
  |Boston   |559.48              |1080.49           |583.81            |
  |Chicago  |3314.44             |5728              |3458.56           |</p>
  <p>I'd like ggplot to use City as the X axis and have three bars for each point on the x axis, one for AverageClientUsage, one for AverageClientEst, one for EstimatedTraffic. How do I go about doing this? At the end I'd like the ggplot to look like this:</p>
  <p><a href="https://i.stack.imgur.com/XirTX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XirTX.png" alt="Plot created using Microsoft Excel" /></a></p>