What do the vertical lines represent in Seaborn bar charts?

Question

I am trying to use Seaborn factorplot from this tutorial.

The following code creates a bar chart with vertical lines. What do those vertical lines represent?

sns.factorplot("kind", "pulse", "diet", exercise, kind="bar")

Answer 1

Those are errorbars. According to the page you linked to:

By default the height of the bars/points shows the mean and 95% confidence interval