Fig. 4
The first four principal components (PC) of the pig scapula. The colours of the 3D images indicate in what direction each PC altered the scapula shape. Red colour indicates growth perpendicular to the surface and blue colour indicates shrinkage perpendicular to the surface. The other plots show the contour of the scapula (x–y, x–z and y–z views) when adding (solid line) or subtracting (dotted line) two standard deviations of score values for each PC