Inversion of local-area helioseismic time-distance data has so far only been done in the ray approximation (Kosovichev 1996). Since this is a high-frequency approximation its applicability can be questioned for the solar case. Bogdan (1997) showed that for a simple solar model the localized wave packets do follow, but are not connned to, the ray path. We use an approximation based on the rst Fr...