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Abstract
Practical formulae which allow the analysis of longitudinal relaxation data are derived from Ernst's theory [1]. They relate to homonuclear coupled spin systems subjected to non-selective pulse sequences of the type (180-τ-α). A general computer programme applicable to any spin system has been written. It allows the calculation of theoretical recovery curves, line by line, as well as the determination, by least squares methods, of dipolar spectral densities and random field rates, from experimental data. Capabilities of the programme are outlined and some examples of its use are given.