Fig. 1

Source http://www.argos-system.org [2]
Satellite pass durations at latitude 20° and 70° per time of day (top and middle panels, each color represents a specific satellite), and Argos satellites cumulated passage time per day (in hours, closed triangles) as well as probability of successful reception of a single (no re-transmit) satellite-relayed message by Argos satellites (open stars) as a function of latitude (lower panel).