**Table 1:** Coordinates of objects discussed in the text.
Object	$\alpha_{2000}$	$\delta_{2000}$
Centre of RCW 79	13 $^{\rm h}$ 40 $^{\rm m}$ 17 $\hbox{$.\!\!^{\rm s}$ }$ 0	-61 $\hbox{$^\circ$ }$ 44 $\hbox{$^\prime$ }$ 00 $\hbox{$^{\prime\prime}$ }$
IRAS 13374-6130	13 $^{\rm h}$ 40 $^{\rm m}$ 53 $\hbox{$.\!\!^{\rm s}$ }$ 2	-61 $\hbox{$^\circ$ }$ 45 $\hbox{$^\prime$ }$ 47 $\hbox{$^{\prime\prime}$ }$
MSX point source	13 $^{\rm h}$ 40 $^{\rm m}$ 53 $\hbox{$.\!\!^{\rm s}$ }$ 1	-61 $\hbox{$^\circ$ }$ 45 $\hbox{$^\prime$ }$ 51 $\hbox{$^{\prime\prime}$ }$
Centre of the compact H II region $^{\footnotesize 1}$	13 $^{\rm h}$ 40 $^{\rm m}$ 52 $\hbox{$.\!\!^{\rm s}$ }$ 5	-61 $\hbox{$^\circ$ }$ 45 $\hbox{$^\prime$ }$ 54 $\hbox{$^{\prime\prime}$ }$
Maser sources	13 $^{\rm h}$ 40 $^{\rm m}$ 57 $\hbox{$.\!\!^{\rm s}$ }$ 6	-61 $\hbox{$^\circ$ }$ 45 $\hbox{$^\prime$ }$ 43 $\hbox{$^{\prime\prime}$ }$

$^{\footnotesize 1}$ Not given in CGPMC. Measured from their Figs. 3 and 5 (about 5 $^{\prime\prime}$ accuracy).