Duration of male swarms for Anopheles coluzzii in VK7 and An. gambiae s.s. in Soumousso. Mean ± s.e. times of the start and end of swarming (i.e., tops and bottoms of bars, respectively) in relation to the time of sunset each month in 2007 (n = 20 swarms/species/month). The 'duration’ time of a swarm is the vertical length of each bar, based on the time scale of the y axis. Sunset and swarm times for Soumousso normalised to VK7 'clock’ times (see Figure 4 legend and Data analysis text). For sunset, s.e. = height of plotted points.