Examples of the horizontally averaged averaging kernels as a function of depth. First and second rows: kernels for the depths of 0–1 Mm (or 0.5 Mm for our inversion) and 5–7 Mm (6.0 Mm depth), respectively. Left-most column: kernel for v_x. Middle: kernel for δc_s. Right-most column: kernel for vertical v_z. We note that the averaging kernels for the v_z inversion using a JSOC-like inversion (denoted as OUR1) have vanishing horizontal intergals because only the difference travel-time geometries were employed (Burston et al. 2015).