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Different types of graphs and charts are described in the following sections.
Most charts are interactive.
* Time series
Most line charts are time series with time on the x-axis. Here is an example:
[[figures/active-graph.png]]
[[figures/active-graph.png]]
This charts shows two variables. The legend at the top right not only specifies the mapping of variables to colours, but also enables *selecting/deselecting* individual variables by clicking on the corresponding legend item.
Hovering the mouse over a point of each line displays *exact values* of both coordinates, as demonstrated by the blue box near the IPv4 line.
The left and right sliders in the small copy of the chart at the bottom can be used to adjust the *limits* on the x-axis, i.e. the time interval.
The toolbar at the top offers several options for *manipulating* the chart, and also for *downloading* either the chart as PNG image or the underlying data in the CSV format. Hovering the mouse over an icon displays a tooltip with a brief explanation.
* Sparklines
A [[https://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0001OR][sparkline]] such as [[figures/sparkline.png]] is a tiny chart