Figure . Resolution as a function of maximum tolerable deviation between fitted and true decay curves. Resolution is defined as a geometric increment between relaxation rates used to construct a set of decay curves that can fit data to within a maximum tolerable deviation. Different resolution curves will be obtained depending on the time increment and the range of decay rates included in construction of the basis curves. This curve was constructed using a range of decay rates between 0.3 and 300 sec -1 . Basis and fitted curves consisted or 2001 points incremented linearly over 10 seconds. 1000 curves having relaxation rates spaced geometrically throughout the range were tested to identify the worst case.