In his article, Marwan Taher discusses how "the STL indictment used to implicate Hezbollah in the killing of Rafic Hariri is based on highly touted telecom-analysis. But an in-depth examination of this evidence reveals that it is unlikely to stand in a fair trial".
The purpose of the infographic is to clearly represent in a timeline the different telephone networks mentioned in the indictment as well as the location, colocation, & chain of events that eventually led to Hariri's assassination on February 14, 2005.
You can read the article here