Solar equatorial rotation rate as a function of depth. The global-mode helioseismology result is given by the black curve. The blue curve is for RDA after averaging over all longitudes. The green and red curves show the ring-diagram results at Stonyhurst longitudes ±52.5°. The shaded areas give the 1σ error estimates. The observations cover more than seven years. The dashed black lines indicate the depth range within which the ring-diagram results are in best agreement with each other.