Fig. 7. Distribution of NRM20 bearings. (A) Distribution of NRM20 bearing for newts tested under full-spectrum light. (B) Distribution of NRM20 bearings for newts tested under long-wavelength light. Each NRM20 bearing provides an estimate of the alignment of a newt's natural remanent magnetism (NRM) when it contacted the 20 cm criterion circle. NRM20 bearings were calculated by adding a newt's NRM declination (Fig. 6) to its magnetic bearing at the 20 cm criterion circle (Fig. 5); see test. NS, not significant; mN, magnetic north.