[dano]

I am assumming that you are speaking of the in-app graph; Where Red is the High, Magenta (Purple) is the Average and Blue is the Low. If that is the case, the more blood sugar test data information that you put into the App the better and more accurate the graph will be. Currently the graph information is not changeable. Please be advised that the Magenta (Purple) is an "Average" that is calculated by the App. I hope the information helps, as I honesty don't understand your exact question.