This is a new feature. It allows you to print the top 4 sparklines on your letters. Here's an example.
Examples: at 60x140 sparklines scale .4 .4 rotate 90 sets the graph to start from 60x140, and uses a vertical orientation going up the left margin 'Scale is optional, and here we scale the X and Y directions down to .4 'Rotate is optional and the only choices are 0, and 90 at 72x790 sparklines scale .4 .4 Would put the sparklines at the top of the page in a horizontal direction