Integrated intensity contours of the ¹²CO emission of the blueshifted and redshifted clouds superimposed on the 1.4 GHz NVSS continuum emission contours. The contour levels range from 3.20 to 19.20 by 1.60 K for the blueshifted cloud, and from 3.86 to 23.17 by 1.93 K for the redshifted cloud. The integration range is from −14.5 to −11.5 km s^-1 for blueshifted cloud, and from −9.5 to −6.5 km s^-1 for redshifted cloud. The contour levels of the 1.4 GHz NVSS continuum emission are 0.95, 1.26, 1.58, 3.16, 6.32, 12.64, 25.29, and 50.58 mJy beam^-1. G63.049-0.348 is an HII region. The letters from A to I indicate the positions of nine molecular clumps, and the symbols “■” indicate the positions of IRAS point sources. The green ellipse indicates the position of bubble N131. The beam size of ¹²CO emission is given in the filled black circle.