Fig. 6From: Using earth mover’s distance for viral outbreak investigationsDeciding whether source is present in a given set of hosts. Here, every circle represents a host, belonging to an outbreak, and green circle represents mean. Edges represent distances between mean hosts and hosts in an outbreak. If there is a host, that is close to mean (so that the distance is smaller than a threshold, case (a)), we conclude, that source is present in an outbreak. Otherwise, analyzed set of hosts doesn’t include the outbreak source (case (b))Back to article page