Range-dependent information about the ocean can be obtained from a vertical slice tomography experiment with a single source-receiver pair (Howe et al., 1987). For this situation we consider the improvement to the estimated fields of sound speed (~temperature) and current velocity possible from receiving hydrophones widely spaced in the vertical at each end of the slice. Simulations were carried otu varying the number of receivers (1--5), the range, and the travel time data error. The ocean was represented by a quasi-geostrophic spectral model with a Gaussian correlation length scale of 100 km. Results are as follows: (1) the range-dependent sound speed field is well revolved at 300 km with additional receivers but poorly resolved at 1000 km, (2) th error in the range-averaged sound speed is reduced substantially by adding more receivers, and (3) errors in the range-dependent and range-averaged current velocity are unaffected by adding receivers. ¿ American Geophysical Union 1987