Fig. 4. Comparison of experimental and simulated data to the universal π rotation of the BIRD^d and the COB-BIRD^d.

Experimental demonstration (black spectral series) of the BIRD^d (A) and the COB-BIRD^d (B) sequences, as well as their comparison to corresponding simulations (superimposed red lines). Experimental data were obtained as described in the main text, and simulations show ${\mathrm{\Phi }}_{\text{PP}}(I_x\to I^{-})$ fidelities on the highlighted elements using on-resonant hard pulses. The COB-BIRD^d pulse sequence is given in Fig. 5.