Left: temperature map of the Serpens core in K. Right: column density map (N_H) of the Serpens core in [×10⁺²⁰ cm^-2]. The center of the image corresponds to the position (α_J2000,δ_J2000) = (18^h 29^m 18^s, + 00° 51′ 08′′) and the size is 94′ × 67′. In both panels the large boxes define the position of the whole Serpens core. The nine filaments considered in our analysis are indicated by numbered boxes. In filaments 1 and 7 the small squared boxes give the positions of the cores. Box 0 represents the control field.