Figure 4 in Termite soldier defence strategies: a reassessment of Prestwich's classification and an examination of the evolution of defence morphology using extended eigenshape analyses of head morphology

Figure 4. Outline data treatment for eigenshape analysis. Original outline described by 300 x,y points: S, start point; F, finish point; LM, landmark point. Converted to 250 equally spaced x,y coordinate points of the open outline. x,y plot of the f points with a 99% tolerance criterion to retain the outline between LM, S and F points.