> #### Types of graphs

> Graphs appearing in Fathom database views belong to one of three families: current, meter, or historical.

> ##### Current

> Graphs that belong to the current family include: pie, bar, and column. Current graphs display the most current data samples.

> ##### Meter

> Graphs that belong to the meter family include: full, half left, half right, half bottom, and half top. Meter graphs display the most current datum sample.

> Figure 2–2 shows a full meter graph.

> Figure 2–2: Full meter graph

> The yellow background indicates the high water mark, while the red arrow indicates the current value. The black area of the graph indicates that a rule has defined a threshold for the data. The meter graph in Figure 2–2 shows that the resource has broken the rule's threshold value.

> ##### Historical

> Graphs that belong to the historical family include: line, hi/low, column, area, stacked column, and stacked area. Historical graphs show values over a period of time.

> Hi/low graphs present the start, high, low, and end values of your data. See Figure 2–3 for a sample hi/low graph.

> Figure 2–3: Hi/low graph

> The highest vertical point on a hi/low graph indicates the high water mark (HWM). The lowest vertical point indicates the low water mark (LWM).

> Historical graphs use dashed lines to indicate thresholds, as shown in Figure 2–4.

> Figure 2–4: Graph with threshold indicated

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