254
Fig. 8 The range of observer variation recorded for Fig.  4, an image of Linnets in flight.
Observation 22, the hollow bar, is the true total (458) provided by a manual count in
ImageJ. Observation 31, an estimate of 3258, has been excluded from the chart for interpretation
purposes
Fig. 9 The range of observer variation recorded for Fig. 5, an image of Golden Plovers in flight.
Observation 24, the hollow bar, is the true total (842) provided by a manual count in ImageJ
C. Hurford