Three upper rows: spatial variations of the dust properties per gas nucleon with the total gas measured by N_{H γ} on a 0.̊375 pixel grid (left) and by N_{H mλ} on a 0.̊125 pixel grid (right). Lower row: colour temperature and β index of the dust SED, measured at 5’ resolution by Planck Collaboration XI (2014) and displayed on a 0.̊125 pixel grid. The A_VQ/N_H values are in units of 10^-22 mag cm², τ₃₅₃/N_H in 10^-27 cm², and 4πR/N_H in 10^-31 W.