Overlays
- Three-dimensional digital models
- Overlay of Back (I) and Back (II), 5 cm differences identified
- Overlay of Back (I) and Back (II), 1.25 cm differences identified
Surface Markings
- Lower-left corners of Back (I) and Back (II)
- Upper-right corners of Back (I) and Back (II)
- Casting irregularities repeated from Back (I) to Back (II)
Cross sections
Overlay of vertical cross sections
Overlaid vertical cross sections of Back (I), in blue, and Back (II), in yellow, 8 centimeters from the left edge of the two works, demonstrating little variation between the backgrounds.
