the CO(2-1) spectra of each individual cloud shown in Fig.\[fig:spectra\]. By analysing the radial velocities and spatial distribution we found that the KN clouds are composed of three clouds we name KN1, KN2, and KN3 in order of decreasing Right Ascension (labelled in Fig.\[fig:COa\]a).

![[*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 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"}](30dorfigcocloseupcss.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 