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Comparison of the number of operations required for the original update equation and its alternative form (a); for GLS (Eq. 9, represented by GLS) and its alternative form (Eq. 16, represented by GLS-AF) (b); for LM (Eq. 5, represented by LM) and its alternative form (Eq. 6, represented by LM-AF) as a function of the ratio of number of estimation parameters to number of measurements (represented by NN∕NM). Memory required for implementing the inversion procedure is plotted in (c).
