(b) In the retrospective cell experiments

Sequence	$\delta /\text{Δ}$ (ms)	$f$ (Hz)	$b$ values (s/mm2)
OGSE cos N=2	25/30	80	0, 250, 500, 750, 1000, 1250, 1500, 1750, 2000
OGSE cos N=1	25/30	40	0, 250, 500, 750, 1000, 1250, 1500, 1750, 2000
PGSE	4/52	N/A	0, 250, 500, 750, 1000, 1250, 1500, 1750, 2000

Notes: Cos means cosine-shaped waveform. $\text{N}$ means the number of oscillating cycles. $\delta$ is the duration of the diffusion gradient while $\text{Δ}$ means the separation time between two diffusion gradients.