GPR data can be gained or re-gained using this operation. To create a gain curve, right-click on the light-blue line that runs across the middle of the o-scope view. Each click along the gain line creates a gain point. Right-clicking on a gain point also removes it. Enter as many gain points as desired. The goal of this is to create a fairly level o-scope view along the top and bottom (they are a mirror image of each other, so you only need to look at one of them). Click the Clear button to clear all gain points and start over. Click Auto Gain to automatically generate a series of gain points that will make contrast equal from the top to the bottom of profiles, based on an average profile.