Left column: spatial distribution of (J = 12–11), (J = 7–6), (J = 7–6) and (J = 5–4) for NGC 7023 NW. The bars give intensities in erg s^-1cm^-2sr^-1. Right column: spatial distribution of dust emission at the wavelength close to the line emission. The bars give νI_ν in Wm^-2sr^-1. All images are presented with the same scale, same field, and same centre. We include the FWHM of the beam in the dust emission maps: 11.6′′, 18.6′′, 18.7′′, 21.3′′ from top to bottom.