On the choice of trade-off parameter in helioseismic SOLA inversion

this report we consider the optimally localized averages inversion method (Backus & Gilbert 1968) where the coefficients c i (r) are explicitly determined to control the resolution and error magnification. We consider the subtractive variant of the method (SOLA method), widely used for the inversion of helioseismic data (Jeffrey 1988; Pijpers & Thompson 1994) as well as for signal processing 2 A. A. Stepanov and J. Christensen-Dalsgaar