To trace the human positions, a set of 200 million anonymous location measurements collected by AirSage3 has been
considered. This dataset covers a region spread over 8 counties in east Massachusetts (Middlesex, Suffolk, Essex, Worcester,
Norfolk, Bristol, Plymouth, Barnstable) with an approximate population of 5.5 million people, and it involves one million
mobile phones (corresponding to a share of 20% of the population approximately), traced for roughly a month.