Equation (1.8) thus gives a simple and useful perspective on why there is no unique quasi-continuous solution and on why multi-exponential decay analysis has low resolution. A single relaxation curve can closely mimic a pair of curves having nearby relaxation rates, and a pair of curves with nearby relaxation rates can closely mimic a single-component curve. The ranges of rates over which these ambiguities apply depend on the noise level and duration of the recorded data. Furthermore, it is apparent that innumerable self-canceling combinations of components can be constructed and included in any model without significantly influencing the decay curve generated by the model.