Maps of the NGC 1333 region. Offsets are relative to the positions given in Sect. 3. a) Shows the Spitzer IRAC channel 2 emission (4.5 μm, retrieved from the Spitzer archive), and b) to e) show the integrated intensity maps of SiO 2  →  1, H¹³CO⁺ 1  →  0, HN¹³C 1  →  0, and H¹³CO⁺ 4  →  3. For maps b) to e) the contour levels start at 5σ, where σ is the estimated rms noise towards the centre of the map (it is higher towards the map edges). The values of σ (and contour step) in K km s^-1 for these maps are: b) 0.044 (0.22), c) 0.094 (0.18), d) 0.056 (0.10), and e) 0.052 (0.26). Map f) shows the H¹³CO⁺ 4  →  3/1  →  0 integrated intensity ratio, with a lowest contour level of 0.1 and step 0.05. The grey-scale image is shown to make the map easier to read. The squares show the location of nearby protostars and the triangles show the Herbig-Haro 7–11 objects. The cross shows the location where we have extracted the single spectra.