Table 1: $V_{\rm lsr}$ radial velocities of HII region complexes only.
Identification H $\alpha$ Radio recomb. Molecular Abs $V_{{\rm syst}}$ $d_{{\rm adopted}}$

km $\rm s^{-1}$ km $\rm s^{-1}$ km $\rm s^{-1}$ km $\rm s^{-1}$ km $\rm s^{-1}$ kpc

330.677-0.396 -61 -66; -4/-47/-58/-67/-81/-96 -66

330.856-0.371 -56 -63; -63; -62.2 -53/-55/-50; -63; -62; -63

-63/-55/-50

331.058-0.437 -63.5

331.1-0.4 -55 -104/-54; -51 -61/-53/-46/-19; -52; -53; -55/-42

331.110-0.506 -68 -66; -51/-64/-94; -66.5 -66; -63/-55/-49 -65 (Near) 4.2

331.169-0.455 -69.4

331.314-0.336 -64 -42/-65/-86/-99; -64.8 -66/-42/-14; -67

331.421-0.360 -62.6

330.286+0.496 -93.5

330.293-0.394 -80

330.949-0.174 -90.5 -89; -100/-91/-62/-44; -91; -89.7 -90; -90; -90/-46

331.026-0.152 -89 -37/-45/-53/-66/-82/-92 -92/-47

331.126-0.239 -87

331.146+0.134 -75.3 -87 (Near) 5.3

331.259-0.186 -85 -89; -88; -111/-98/-88/-67/-49; -87.7 -89

331.353-0.013 -81 3/-4/-47/-66/-78/-87/-92/-99 -89/-66/-49

331.517-0.069 -89 -100.7; -90; -89; -89/-59 -100/-89/-57/-48;

-100/-89/-56/-48/-41;

-89/-64/-50/-42/-18/0.4

331.354+1.07 UKST -79 -78.3 -79 (Near) 4.9

RCW103 -43 -99/-89/-72/-46/-30/-26 -43

332.783-1.445 -41 to -53 -41 -42 (Near) *3.2

(=RCW104)

331.360+0.507 UKST -46 -96/-64/-46/-38/-23 -46/-38

332.148-0.446 -55 -55 -55.5; -57/-74; -55.7 -57; -56; -57/-43

332.293-0.095 -48.4

332.322-0.563 -51.9

332.541-0.111 -50 -50 -82/-70/-57/-48; -46.7 -49

332.662-0.607 -51 -48 -50; -52; -49.6 -73/-50; -50; -57/-50

(=RCW106) -57/-50

332.789-0.564 -54 -57 -55.7; -55; -59; -57; -59; -59

-107/-57/-49

332.978+0.792 UKST -52 -85/-74/-60/-48/-36/-31; -44.5 -48

333.114-0.441 -52 -54; -54; -51; -52; -51.2 -52; -55/-44/-20

-54/-19 -52 (Near) *4.2

333.251+0.06 UKST -46.9

333.340-0.129 -59.7

333.469-0.162 -45.3

333.292-0.371 -50 -52; -52; -107/-52; -49.5 -54/-44/-50/-23; -57

-55/-42; -57

333.684-0.457 -50 -104/-88/-55/-43/-33/-13/-5

333.0-0.4 -54; -56; -54; -107/-71/-55 -55; -55/-23; -54

-54/-42/-22; -56

333.3-0.4 -50.1 -51 -54/-44/-40/-23; -54; -54

333.0+0.8 -52 -48

333.0-0.6 -52 -48

RCW102 -53 to -64 -55

333.6-0.1 UKST -54 -88/-71/-51/-40 -87/-44

333.61-0.208 -46.5 -46 -51; -109/-89/-51/-36 -41; -53/-42; -46/-41

-91/-46/-40/-13; -52/-42

331.9+2.8 -25

331.9+2.4 -27

332.956+1.804 -22.2 -24 (Near) *1.9

(=RCW105)

333.04+2.02 -21.3 -20 3/-8/-32/-35/-59

(=RCW105)

332.769-0.007 -95

333.168-0.081 -91 -91.8; -12/-47/-62/-69/-87/-101/-105 -89/-47/-19

333.2-0.1 -91 -89/-47/-19; -88; -87 -91 (Near) 5.5

333.0+0.0 -91

333.726+0.366 UKST -33 -33 (Near) 2.5

334.173+0.068 -70 -20/-40/-65/-89/-102 -86/-40 -73 (Far) 10.7

334.529+0.825 -77

334.684-0.107 -32 -2.5/-33/-44/-88/-112 -33 (Far) 12.8

334.714-0.665 16 11/17/-20/-38/-43/-92/-102 17 17.4

334.330+0.967 -50.4

335.582-0.284 -46.6

335.748-0.134 -52 -45 -50 (near) *4.2

335.751+0.110 -51 -38

335.978+0.18 -79 -36/-42/-46/-56/-62/-70/-77/-108/-124 -37 -78 (Near) 4.9

336.022-0.819 -48.3 -48 (Far) 12.1

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 Results
	4 Distance of stellar tracers
	5 Discussion
	6 Conclusion
	References
	Online Material

Identification	H $\alpha$	Radio recomb.	Molecular	Abs	$V_{{\rm syst}}$	$d_{{\rm adopted}}$
	km $\rm s^{-1}$	km $\rm s^{-1}$	km $\rm s^{-1}$	km $\rm s^{-1}$	km $\rm s^{-1}$	kpc
330.677-0.396		-61	-66; -4/-47/-58/-67/-81/-96	-66
330.856-0.371		-56	-63; -63; -62.2	-53/-55/-50; -63; -62; -63
				-63/-55/-50
331.058-0.437			-63.5
331.1-0.4		-55	-104/-54; -51	-61/-53/-46/-19; -52; -53; -55/-42
331.110-0.506		-68	-66; -51/-64/-94; -66.5	-66; -63/-55/-49	-65 (Near)	4.2
331.169-0.455			-69.4
331.314-0.336		-64	-42/-65/-86/-99; -64.8	-66/-42/-14; -67
331.421-0.360			-62.6
330.286+0.496			-93.5
330.293-0.394			-80
330.949-0.174		-90.5	-89; -100/-91/-62/-44; -91; -89.7	-90; -90; -90/-46
331.026-0.152		-89	-37/-45/-53/-66/-82/-92	-92/-47
331.126-0.239			-87
331.146+0.134			-75.3		-87 (Near)	5.3
331.259-0.186		-85	-89; -88; -111/-98/-88/-67/-49; -87.7	-89
331.353-0.013		-81	3/-4/-47/-66/-78/-87/-92/-99	-89/-66/-49
331.517-0.069		-89	-100.7; -90; -89; -89/-59	-100/-89/-57/-48;
				-100/-89/-56/-48/-41;
				-89/-64/-50/-42/-18/0.4
331.354+1.07	UKST	-79	-78.3		-79 (Near)	4.9
RCW103	-43		-99/-89/-72/-46/-30/-26	-43
332.783-1.445	-41 to -53	-41			-42 (Near)	*3.2
(=RCW104)
331.360+0.507	UKST	-46	-96/-64/-46/-38/-23	-46/-38
332.148-0.446	-55	-55	-55.5; -57/-74; -55.7	-57; -56; -57/-43
332.293-0.095			-48.4
332.322-0.563			-51.9
332.541-0.111	-50	-50	-82/-70/-57/-48; -46.7	-49
332.662-0.607	-51	-48	-50; -52; -49.6	-73/-50; -50; -57/-50
(=RCW106)				-57/-50
332.789-0.564	-54	-57	-55.7; -55; -59; -57;	-59; -59
			-107/-57/-49
332.978+0.792	UKST	-52	-85/-74/-60/-48/-36/-31; -44.5	-48
333.114-0.441		-52	-54; -54; -51; -52; -51.2	-52; -55/-44/-20
				-54/-19	-52 (Near)	*4.2
333.251+0.06	UKST		-46.9
333.340-0.129			-59.7
333.469-0.162			-45.3
333.292-0.371		-50	-52; -52; -107/-52; -49.5	-54/-44/-50/-23; -57
				-55/-42; -57
333.684-0.457		-50	-104/-88/-55/-43/-33/-13/-5
333.0-0.4			-54; -56; -54; -107/-71/-55	-55; -55/-23; -54
				-54/-42/-22; -56
333.3-0.4		-50.1	-51	-54/-44/-40/-23; -54; -54
333.0+0.8		-52		-48
333.0-0.6		-52		-48
RCW102	-53 to -64		-55
333.6-0.1	UKST	-54	-88/-71/-51/-40	-87/-44
333.61-0.208	-46.5	-46	-51; -109/-89/-51/-36	-41; -53/-42; -46/-41
				-91/-46/-40/-13; -52/-42
331.9+2.8			-25
331.9+2.4			-27
332.956+1.804			-22.2		-24 (Near)	*1.9
(=RCW105)
333.04+2.02	-21.3	-20	3/-8/-32/-35/-59
(=RCW105)
332.769-0.007			-95
333.168-0.081		-91	-91.8; -12/-47/-62/-69/-87/-101/-105	-89/-47/-19
333.2-0.1		-91		-89/-47/-19; -88; -87	-91 (Near)	5.5
333.0+0.0				-91
333.726+0.366	UKST		-33		-33 (Near)	2.5
334.173+0.068		-70	-20/-40/-65/-89/-102	-86/-40	-73 (Far)	10.7
334.529+0.825		-77
334.684-0.107		-32	-2.5/-33/-44/-88/-112		-33 (Far)	12.8
334.714-0.665		16	11/17/-20/-38/-43/-92/-102		17	17.4
334.330+0.967			-50.4
335.582-0.284			-46.6
335.748-0.134		-52		-45	-50 (near)	*4.2
335.751+0.110		-51		-38
335.978+0.18		-79	-36/-42/-46/-56/-62/-70/-77/-108/-124	-37	-78 (Near)	4.9
336.022-0.819			-48.3		-48 (Far)	12.1