The Measurement section defines the type of data used in the presently selected curve in the Curves section. When a Measurement is selected, the Properties section of the Manage Curves dialog box is updated with the parameters for that measurement.
There are six categories of measurements. To expand a category click on the before the Category name. To collapse a category list, click on the before the Category name.
NOTE: If you have loaded a user equation file in the Preferences dialog box, a "User Equations" category appears with a list of equations from the file.