Integrated intensity maps of NH₃ (1,1) (left and right). The reference position is l = 28.59°, b = 3.55°. The integration range is 4 < V_LSR < 10 km s⁻¹. Contours start at 0.13 K km s⁻¹ (3σ) on a main beam brightness temperature scale and go up in steps of 0.13 K km s⁻¹. The unit of the color bars is K km s⁻¹. The half-power beam width is illustrated as a black filled circle in the lower left corners of the images. Left and right panels: the red points show the positions of the 362 candidate prestellar cores and 49 protostellar cores taken from Könyves et al. (2015), respectively. The red line in the top right of each map illustrates the 1 pc scale at a distance of 436 pc (Ortiz-León et al. 2017, 2018).