Rex and/or ΔRex with varied amide and fast exchanging amine concentrations (a, b), amide-water and fast exchanging amine-water exchange rates (c, d), T1w (e, f), T2w (g, h), fm (i, j), and kmw (k, l). Each set of parameters was varied with other parameters remaining at the values in bold in Table 1. 1 μT and 3.6 μT powers are used for getting Rex for slow exchanging amides and fast exchanging amines, respectively.