Change in the rotational splitting of the ℓ = 1, ν = 2807.5   μHz p-mode owing to ℓ = 4 multiplets, assuming the same amplitude for all modes with different m but the same ℓ,n numbers, and considering the τ_NAf term. As before we assume the same energy for all modes and fix it so that the ℓ = 3,ν = 276   μHz mode would have an observed velocity v_obs = 1   km s^-1 if it were to be observed at an optical depth log τ_R =  −3. Model 1 has been used.