@dewangan18x for more details]. Photometric magnitudes of point-like sources at 3.6–5.8 $\mu$m were downloaded from the [*Spitzer*]{} GLIMPSE-I Spring’ 07 highly reliable catalog. In this work, we considered only sources with a photometric error of less than 0.2 mag in each [*Spitzer*]{} band.

Figure \[fig3\]a shows the overlay of the positions of 901 Class I YSOs on the ATLASGAL 870 $\mu$m map (see blue circles). In Figures \[fig3\]b and \[fig3\]c, we present surface density contours (in blue) of Class I YSOs overlaid on the ATLASGAL 870 $\mu$m dust continuum map and the NVSS 1.4 GHz radio continuum map, respectively. The surface density contours are shown with the levels of 1.2, 2, 3.5, and 6.5 YSOs/pc$^{2}$, where 1$\sigma$ = 1.1 YSOs pc$^{-2}$. A spatial correlation between the dust continuum emission and the Class I YSOs is also clearly seen in Figure \[fig3\]b. A majority of Class I YSOs [mean age $\sim$0.44 Myr; @evans09] are seen toward the [*Herschel*]{} filaments (i.e.,“fs1" and “fs2") and the H[ii]{} regions, indicating the presence of the early stage of SF in the selected physical system. The surface density analysis is performed using the nearest-neighbour (NN) method [see @casertano85; @gutermuth09; @bressert10; @dewangan17 for more details]. Following the 