Normal Transform

The Normal Transform dialog enables you to specify the mean, standard deviation, expansion, and contour interval.

Zone Colour Ranges using Normal Transform

This method divides the range up around the input mean using a normal distribution. The expansion factor multiplies the standard deviation, so if the expansion is 2, then the colour ranges will each cover two standard deviations in the transform.

If a contour level is defined, once the transform is fully calculated, values between the min and max are adjusted to the nearest multiple of the contour interval.