Position–velocity diagram of H I. Superposed white solid contours indicate ¹²CO(J = 3–2) intensity. The integration range in R.A. is from ﹩{05}^{{\rm{h}}}{24}^{{\rm{m}}}{57}^{{\rm{s}}}﹩ to ﹩{05}^{{\rm{h}}}{25}^{{\rm{m}}}{09}^{{\rm{s}}}﹩. The lowest contour and contour intervals of CO are 0.003 K degree and 0.005 K degree, respectively. The dashed white line delineates an H I cavity with the H I intensity of 0.3 K degree. The beam size and velocity resolution are also shown in the bottom right corner. Horizontal dashed lines represent observed boundaries of CO.