cascade plot legend isn't aligned with platform chart

[Pennycook]

Expected behavior

It should be possible to align the platform chart legend with the platform chart.

Actual behavior

The current behavior places the legend slightly too low, and the spacing between entries is off.

Steps to reproduce the problem

This is the default behavior for all cascade plots.

Specifications

p3==0.1.0

[Pennycook]

I've done some experimenting with this today, and there are a few options to legend that are helfpul:

• frameon=False removes the legend frame and makes a little more space
• borderpad=0 and borderaxespad=0 remove additional spacing outside and inside of the legend box
• labelspacing adjusts the vertical spacing between labels

The problem seems to be that all of these values are in font-sized units, not axis-sized units. The following produces reasonable results at the default plot settings:

frameon=False,
borderpad=0.4,
borderaxespad=0,
labelspacing=0.525,

...but hard-coding so many magic constants into the cascade plot script seems like a very bad idea, and I suspect that the values will produce bad results if plots are resized or customized in any way.

It may be a better idea to try and think of another way to make use of the whitespace in the bottom-right corner, and then move the legend(s) somewhere else.