-Coordinates are then used to calculate latency between two hosts by
-calculating the euclidean distance between the two hosts coordinates.
-The results express the latency in ms.
+Coordinates are then used to calculate latency (in microseconds)
+between two hosts by calculating the distance between the two hosts
+coordinates with the following formula: distance( (x1, y1, z1), (x2,
+y2, z2) ) = euclidian( (x1,y1), (x2,y2) ) + abs(z1) + abs(z2)
+
+In other words, we take the euclidian distance on the two first
+dimensions, and then add the absolute values found on the third
+dimension. This may seem strange, but it was found to allow better
+approximations of the latency matrices (see the paper describing
+Vivaldi).