As you move your mouse over the lines, the software highlights the lines in both the graph and in the signal viewer window. The Reference log is always the first log loaded and is indicated by the lines being dotted (sometimes appearing lighter) and the New log being that later log and appearing with solid lines. The Software allows you to enter time slip and weather information, then the software puts the markers for the increments you have entered and shows the comparison between the two. Where instances appear more than one launch time is found, the one with the higher throttle position at launch will be selected, or you will be asked to manual zero the run. The software will automatically select and zero the run based on the start of your launch timer. Abilbity to compare two run logs being compared, the first being a 7.91 second pass, and the next pass being a 7.74 second pass.