Fig. 5. A plot of eqn (1) for T1 = 50 s and tb = 3.5 s. Geometric parameters entering the equation are as declared in the main text. The T1 limited and gas-uptake limited regimes are highlighted in blue and red, respectively. The integral of the signal for the full di-hydritic spectral region, as a function of sample flow, is also reported. Values have been uniformly scaled so that the maximum value (at 60 μL min–1) matches the ratio between the referenced hydride signal integrals from the bulk sample SABRE measurement (Fig. 3a) and the alveolus SABRE measurement (Fig. 3b), which is about 50%.
