Integrated intensity map of the CN (N = 1 − 0,J = 3/2 − 1/2) hyperfine components, obtained with EMIR in May 2009. The black contour represents the 3-σ integrated intensity level (7.3 K km  s^-1) in the map. The crosses show the location of the millimeter dense cores mapped with MAMBO on the IRAM-30 m by Peretto et al. (2006). The white dashed contour shows the value of column density  ~1 × 10²³ cm^-2, inferred from the MAMBO and P-ArTéMiS continuum maps (Maury et al. 2009). The circle shows the location “Z” where we carried out further polarimetric observations to probe the Zeeman effect.