Fig. 4. Analysis of body axis orientation. (A) Sample flight of a bee, measured at intervals of 1/50 s (dots). Lines associated with larger dots indicate the body axis direction, as measured from image analysis. For clarity, body axis direction is only shown at intermittent positions. (B) Correlation between body axis direction as measured from image analysis and inferred from path analysis. The analysis is based on 437 flights (obtained from five bees, of which data are shown in Figs 6 and 8). Portions of flight at speeds below 0.5 m s^–1 were omitted. The coefficients of the regression (y=ax+b) are: a=0.982, b=0.96; r²=0.993. Red lines indicate 95% confidence intervals.