Reply to comment:

Frank Furthmüller
I have a feature request: Implement two buttons to toggle the scale of the Y-Axis between "starting by the lowest value" (as it is now) or "starting by zero" and "ending by the highest value of that single graph" or "ending by the highest value of all graphs", please. This could help seeing geographical diversity in latency at a glance. Besides that: Great Work! *ThumbsUp