This dialog is activated by selecting the **Average Multiple Curves...** command from the Analysis menu.

The table at the top of the dialog displays all the curves available in the active plot layer and their X data range.
It allows users to select the curves to be averaged, by checking the corresponding box from the *Use* column.

The *Averaged X* list box can be used in order to specify how X values will be computed for the averaged output curve. There are four methods available:

*Same as Curve*: uses the X values of the data curve selected in the list box bellow. For the selected curve, the exact Y values are used when calculating the average. For all other datasets the Y values are interpolated.*Common X Range*: generates a set of equally spaced X values from the largest minimum X to the smallest maximum X and calculates the average of all interpolated Y.*Full X Range*: generates a set of equally spaced X values from the smallest minimum X to the largest maximum X and calculates the average of all interpolated Y.*Custom*: generates a set of equally spaced values within the specified X range and calculates the average of all interpolated Y.

The *X Minimun* box displays the lower limit of the X range for the averaged curve. It can be edited only when the method selected in the *Averaged X* list box is *Custom*, otherwise it is read-only.

The *X Maximum* box displays the upper limit of the X range for the averaged curve. It can be edited only when the method selected in the *Averaged X* list box is *Custom*, otherwise it is read-only.

The *Interpolate* list box can be used to control the interpolation method. Three methods are available:
*Linear*, *Cubic* and *Non-rounded Akima*. Please note that each of these methods require a minimum number of data points in the input curves which is 2, 3 and 5 respectively.

The *Points* box is read-only if the method selected in the *Averaged X* list box is *Same as Curve*. Otherwise it can be used to specify the number of points for the interpolated curves.

The *Color* box can be used to specify the color of the output curve.

If the *Delete average curves* button is pressed all output curves generated during the current session of the dialog are deleted.