Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Bluetooth scanning statistics. A) The total number of scans made by each smartphone in the 5-day period displayed on a logarithmic scale. B) Scanning rate for each edge of the network. The scanning rate between node A and B is determined by the number of scans by smartphone A and B combined, as the edges are undirected (symmetric). The horizontal dotted line reflects a scanning rate of 1 scan every 10 min; the dashed line 1 scan every 2 h.
