Spatial distribution and surface density of stars and gas within NGC 1333 obtained using 2D KDEs with a FWHM = 220 arcsec. From left to right: (1) all stars (solid squares); (2) Classes Flat, II, and III (solid triangles); (3) Classes 0/I (solid circles); (4) dense cores (open squares); (5) fiber axis (red lines). Contour levels are equally spaced every 100 objects pc^-2 in all submaps. For reference, the N₂H⁺ emission (grey contours) as well as the positions of the different IRAS sources (orange stars) are indicated in all subpanels.