Identified faces produce pairs of identical temperature circles on the CMB sphere (Cornish-Spergel-Starkman 1998).
Angular separation between paired centres: 180° · Angular radius of each circle: 54° (canonical ≈45°)
Wavelengths longer than the fundamental cell cannot fit. The lowest multipoles are damped relative to flat ΛCDM.
A Mollweide projection of the sky, with a low-l field aligned along the topology axis. Schematic only.
Preferred axis : θ = 90°, φ = 0°