David H. Sianturi

### Summary A Mixed Chart is a visualization that allows the combination of two or more distinct graphs. The features of each chart are retained on the mixed chart plot....

This pull request applies code style fixes from an analysis carried out by [StyleCI](https://github.styleci.io). --- For more information, click [here](https://github.styleci.io/analyses/16onGN).

This pull request applies code style fixes from an analysis carried out by [StyleCI](https://github.styleci.io). --- For more information, click [here](https://github.styleci.io/analyses/22Ppj4).

This pull request applies code style fixes from an analysis carried out by [StyleCI](https://github.styleci.io). --- For more information, click [here](https://github.styleci.io/analyses/xgMbG0).

This pull request applies code style fixes from an analysis carried out by [StyleCI](https://github.styleci.io). --- For more information, click [here](https://github.styleci.io/analyses/yrMPVG).

This pull request applies code style fixes from an analysis carried out by [StyleCI](https://github.styleci.io). --- For more information, click [here](https://github.styleci.io/analyses/GPx6kV).