In practice, it is quite convenient to use this format with the matrix pencil method applied to inversionrecovery T1-T2 data. The component selection heuristics reliably find components that accommodate the non-decaying basis curves and assign negligible relaxation rates to those components. The resulting analyses give expected offset and zeros to within the uncertainty. As with the one-dimensional case, the parameters yielded by autoregressive methods can be refined using least-squares fitting.