white box. The outermost CO(2-1) contours integrated over the 235–240kms$^{-1}$, and 245–250kms$^{-1}$ are shown in magenta and red respectively, with the second outermost contour of the 240–245kms$^{-1}$ also shown. The solid white line marks the position of the slice shown in the middle panel. [*Middle*]{}: Position velocity slice of the CO(2-1) cube in linear scale along the direction of the slit given by the solid white line in the top panel. The slit cuts along the centre of the stapler nebula. [*Bottom*]{}: CO(2-1) spectra of each cloud extracted from the region bounded by the contours shown in top panel. The dashed lines for each cloud is it’s $V_{\rm{lsr}}$ given in Table 1. []{data-label="fig:spectra"}](pv2.jpg "fig:"){width="49.50000%"} ![[*Top*]{}: The stapler nebula blown up from the HST mosaic in Fig.1, with the stapler region is outlined with the dashed white box. The outermost CO(2-1) contours integrated over the 235–240kms$^{-1}$, and 245–250kms$^{-1}$ are shown in magenta and red respectively, with the second outermost contour of the 240–245kms$^{-1}$ also shown. The solid white line marks the position of the slice shown in the middle panel. [*Middle*]{}: Position velocity slice of the CO(2-1) cube in linear scale along the direction of the slit given by the solid 