Extended Data Fig. 2: Dark spin resonance frequencies under different magnetic field directions.

Dark spin resonance frequencies measured by |ψ2⟩-DEER spectroscopy under external magnetic fields along the NV1 axis (a) and the NV2 axis (b).

Dark spin resonance frequencies measured by |ψ2⟩-DEER spectroscopy under external magnetic fields along the NV1 axis (a) and the NV2 axis (b).