Panels a and d: color-scale images represent the distributions of the integrated intensity for ¹²CO(1–0) and ¹³CO(1–0) lines in the velocity range of −5 to 10 km s⁻¹. The red circles denote the IRAS sources in the filament S242. The orange star represents the star BD+26 980, which triggers the HII region associated with the S242-S region. The white dashed circles indicate the Planck Galactic cold clumps G181.84+0.31 and G182.04+0.41. The black and white contours in all the panels, except for panel b, display the H₂ column density distribution of S242, which derived as Dewangan et al. (2017), ranging from 25 to 90% stepped by 15% of the value (2.0 × 10²² cm⁻²). Panel b: excitation temperature map derived from ¹²CO(1–0) line. The white contours display ¹³CO column density distribution of S242, ranging from 10 to 90% stepped by 15% of the value (2.0 × 10¹⁶ cm⁻²). Panel c: ¹³CO column density map. Panel e: centroid velocity field of S242, which derived from the Gaussian fitting of ¹³CO(1–0) line. Panel f: distribution of FWHM velocity width for S242, which derived from the Gaussian fitting of ¹³CO(1–0) line. The orange circle in panel f shows the effective beam size of TRAO.