Sensitivity of solar f-mode travel times to internal flows
  We compute f-mode travel-time sensitivity kernels for flows. Using a two-dimensional model, we show that it is important to account for several systematic effects, such as the foreshortening and the projection of the velocity vector onto the line of sight. Correcting for these effects is necessary before any data inversion is attempted away from the center of the solar disk. 
J. Jackiewicz, L. Gizon, A. Birch