In case you don’t want risers (vertical lines) in step line chart, you can easily disable them by setting “noStepRisers”: true in your graph’s config.
Graph in scrollbar
Scrollbar of Serial chart can display a rough graph inside itself. Usually the type of this graph is the same as the original graphs, but you are free to set any type here. For example, if you have a candlestick chart, you might want to have a simple line graph in a scrollbar.