AVE has calculated and adjusted the scales automatically, so the curve is shown at full amplitude. There are context menus. Following the latest trends in user interfaces, AVE provides this feature at any moment. Just click the right button of your mouse and the most desirable options menu will be displayed on your screen. It is possible to configure several items of the light curve graphic.
Scale is adjusted automatically for every night.
In that case, the Merit curve represents how clustered are the points respect the the average curve. That implies that the lowest the value of the function, the highest probabilitys is that the periode produced on this mimimum is significative. Do not worry, it is easy now. A nice eclipsing light curve. What we need now is to determine several minima and the exact moment of each one of them.