Neutral hydrogen distribution around RCW 86. Top: the HI distribution is displayed with a linear scale between 32.8 and 89.8 K in an ample field around RCW 86 at the LSR radial velocity of −34 km s−1. Bottom: the same, but in a smaller field in the vicinity of RCW 86, displayed between 32.8 and 73.3 K to emphasize the presence of the internal shell. The white contours show the radio continuum emission at 843 MHz from the MGPS-2 data. The line included in the bottom panel indicates the direction where the distribution profile shown in Figure 7 was extracted.