See the line chart below.
It's very difficult to see the trends of each line the graph above. There's a total of 6 lines that could differ in the pennies range, but that's not easily distinguishable from above.
If there was a way to set the min value on the Y-Axis to something closer to the minimum value of all points on the graph and set the max value of the Y-Axis to something close to the max value of all points on the graph, then it would be easier to visualize fluctuations between lines. Doing this automatically would be great, but having a manual option to configure this would be just as valuable.