Figure 4From: Sex difference in response to stress by lunar month: A pilot study of four years' crisis-call frequencyDifferences (female less male) in daily calls over 1995–98, summed by lunar-day Numbers 1 – 29, and expressed as % deviations from mean. The thin line was obtained by applying the same procedure to half of the data for 'strong moons' (see text).Back to article page