Integrated intensity maps of NH₃ (1,1) (left) and (2,2) (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. 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). Left panel: black stars show the positions of the identified 38 ammonia clumps (see Sect. 3.2).