Integrated-intensity maps of HCN isotopologs in the PDS 70 disk. The brightness temperatures were obtained assuming the Rayleigh-Jeans approximation. The HCN (4–3) map in the bottom right panel was obtained from SB observations alone. The white contours show the bright ring in the submillimeter continuum emission (Isella et al. 2019), the white dots mark the position of the two forming planets (2020 astrometry data from Wang et al. 2021), and the gray ellipse in the bottom left corner of each panel shows the synthesized beam.