Graphite chart Y-Axis scale changes with width and height of graph

https://answers.launchpad.net/graphite/+question/152690

I made the chart wider (1400 pixels for 700 minutes of time), thereby having more pixels than horizontal data points.

I was struggling to find the place to manage my legend for each chart, check out the Apply Function menu, and then go down into Special | Add values to legend name | {choices}