> OctoPerf's load testing - Area Range Chart Report Item documentation page. Area Range Chart Report Item edition and usage.

Source: https://api.octoperf.com/doc/analysis/edit-bench-report/report-items/area-range-chart/

# Area Range Chart Report Item

Area range chart are most often used and generated by the [Insights table report item](https://api.octoperf.com/doc/analysis/edit-bench-report/report-items/insights/).

They are used to compare two metrics. For example the chart bellows compares the hit rate to the user load over time.
It helps to look for [hit rate inflexion points](https://api.octoperf.com/doc/analysis/tips/#inflexion-point):

![area-range-chart.png](https://api.octoperf.com/doc/analysis/edit-bench-report/report-items/img/area-range-chart.png)

## Configuration

![area-range-chart-configuration.png](https://api.octoperf.com/doc/analysis/edit-bench-report/report-items/img/area-range-chart-configuration.png)

This chart has two [metrics](https://api.octoperf.com/doc/analysis/edit-bench-report/performance-metrics/):

* A reference metrics (the first one),
* A comparison metric (the second one).

Several metrics are available, please report to the [Hit Metrics Availability](https://api.octoperf.com/doc/analysis/edit-bench-report/performance-metrics/#hit-metrics-availability) tables.

The configuration settings tab allows you to set:

| Rule           | Description                                                                                                                                                              |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Title          | The chart title displayed in the [report items list](https://api.octoperf.com/doc/analysis/edit-bench-report/#items-list) or when [exporting the report](https://api.octoperf.com/doc/analysis/export-bench-report/).                         |
| Reference Type | The type of the reference metrics: **Histogram** for a dynamic value over time, **Summary** for an average constant value.                                               |
| Range Type     | The way both metrics are compared to each other: **Raw** for raw values (both metrics must have the same unit) or **Percentage** to compare metrics with different units |

For example the following chart is used to compare the evolution of the response time standard deviation over time to its average value:

![area-range-chart-summary.png](https://api.octoperf.com/doc/analysis/edit-bench-report/report-items/img/area-range-chart-summary.png)

## Export

To export the table please refer to the [dedicated documentation page](https://api.octoperf.com/doc/analysis/export-bench-report/export-report-items/#exporting-charts).