Table 1. Table of transformation compatibilities.

COIL-100 is a library of images of 100 common household items photographed from a range of orientations using a turntable [114]. The wire objects resemble those used in psychophysics and physiology experiments: [79–81]. They were generated according to the same protocol as in those studies.

Object class	Transformation	$\overline{\psi }$
Chairs	Rotation in depth	0.00540
Fig 3 faces	Rotation in depth	0.57600
Fig 3 class B	Rotation in depth	0.95310
Fig 3 class C	Rotation in depth	0.83800
Fig 3 all classes	Rotation in depth	0.26520
COIL-100 [114]	Rotation in depth	0.00630
Wire objects [80]	Rotation in depth	-0.00007