Fig.3. The relationship between Julian date and log₁₀-transformed plasma creatine kinase activity of bar-tailed godwits captured during a migratory stopover in the Wadden Sea. Closed circles, solid line, ‘early arrivals’; open circles, dotted line, ‘late arrivals’. Statistical analyses were performed on these data controlling for bleed-time, but the visual presentation of residuals would be nearly identical.