Grapher can calculate the area under a curve to any baseline value. The

**Graph Tools | Plot Tools | Calculate Area**command computes the area under a line/scatter plot, ribbon/wall plot, or 3D XYZ line/scatter plot. When calculating area for 3D XYZ line/scatter plots, the area is calculated only for the XY plane. The area is reported in the graph's XY units using zero as the base line.To calculate the area:

- Create a line/scatter, ribbon/wall, or 3D XYZ line/scatter plot using the
**Home | New Graph | Basic**commands. - Click on the plot to select it.
- Click the
**Graph Tools | Plot Tools | Calculate Area**command. - Enter a baseline value (Y value to calculate the area down to, default is zero) into the
**Area Baseline Value**dialog and click*OK*. - A
**Grapher - Report**window opens containing the area and information such as the data file, X column, and Y column used to create the plot. The area is reported in the graph's XY units.

**Area Tip 1**

The area is calculated by finding the area between the plot and baseline value entered in the **Area Baseline Value **dialog. If any part of the plot extends below the baseline value, a negative area is calculated and this value is added to the total area. The area report displays area *Above Baseline Area, Below Baseline Area*, and *Total Area*.

**Area Tip 2**

The units for the area are X units * Y units. For most situations, the X and Y values should be in the same units before using this command for the calculated area value to make sense.

*Updated September 21, 2018*

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