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Second brood productivity (ρ2) against second brood mean flight date (μ2; week number from 1 April) for brown argus at (a) Geraniaceae, and (b) Helianthemum sites. Each point represents a yearly estimate for each of (a) 80 and (b) 213 sites. Years are shown in different colours to allow visualization of both within-year and among-year changes in productivity (ρ).
