Left: velocity-integrated HCN(5–4) map of PLCK_G244.8+54.9 from ALMA (red contours) with a beamsize of 0.78″ × 0.67″ at PA = −83.6° (red ellipse in the lower-right corner), compared with the CO(4–3) line emission (white contours) and 3-mm dust continuum (grey background) at 0.1″ resolution from C17a. Contour levels are 4σ, 6σ, 8σ (red) and 3σ, 6σ, 9σ (white). Right: zoom onto the morphology of the velocity-integrated HNC(5–4) line emission blended with CN(4–3) (see Sect. 3.3). The black contours correspond to the white ones in the left panel. Local velocity-integrated flux densities of the blended HNC(5–4) line are shown as a color map, with the same beamsize of 0.119″  ×  0.081″ as CO(4–3) (grey ellipse in the lower-left corner).