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Examples of legend groups

The examples of legend groups here

and here

https://plot.ly/~PlotBot/453/first-legend-group-first-legend-group-average-second-legend-group-second-legend-/#plot

Don’t really do anything different than you can achieve with marker and line styles.

Could someone please show me some examples of using legend groups that are a little more rich so I could know the true power of legend groups?