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Table A.1

Complete catalog of HII regions detected in absorption.

ℓ  ± b Distance Tobs TF Te ϵF Source
kpc × 103 K × 103 K × 103 K K pc−1
(1) (2) (3) (4) (5) (6) (7)
287.5 − 0.5 2.5 ± 0.625 29.0 ± 2.554 2.08 ± 0.12 5.0 ± 0.5d 0.83 ± 0.21 [1]
336.7 − 1.3 1.3 ± 0.325 58.0 ± 3.605 4.59 ± 1.48 5.0 ± 0.5d 3.53 ± 1.44 [1]
85.5 − 1.0 0.8 ± 0.29 23.4b ± 10.0 0.66 ± 0.2 6.0 ± 1.0c 0.82 ± 0.39 [2]
99.3 + 3.7 0.86 ± 0.055 43.4b ± 10.0 1.41 ± 1.58 6.0 ± 1.0c 1.64 ± 1.85 [2]
118.5 + 6.0 0.84e ± 0.084 36.1b ± 10.0 1.14 ± 0.88 6.0 ± 1.0c 1.35 ± 1.06 [2]
134.8 + 0.9 2.2 ± 0.097 52.0b ± 10.0 1.74 ± 2.77 6.0 ± 1.0c 0.79 ± 1.26 [2]
160.1 − 12.3 0.4 ± 0.039 29.9b ± 10.0 0.9 ± 0.47 6.0 ± 1.0c 2.26 ± 1.2 [2]
195.1 − 12.0 0.4 ± 0.04 26.4b ± 10.0 0.77 ± 0.31 6.0 ± 1.0c 1.93 ± 0.79 [2]
202.9 + 2.2 0.8 ± 0.25 29.1b ± 10.0 0.87 ± 0.43 6.0 ± 1.0c 1.09 ± 0.64 [2]
6.1 − 0.6 12.7 ± 0.09 –7.0 ± 1.0a 14.0 ± 1.8 7.0 ± 2.0 0.89 ± 0.11 [3]
6.2 − 0.6 12.9 ± 0.11 –7.2 ± 1.0a 14.2 ± 1.7 7.0 ± 2.0 0.92 ± 0.11 [3]
6.4 − 0.5 3.8 ± 0.11 –3.6 ± 1.0 10.6 ± 2.2 7.0 ± 2.0 0.43 ± 0.09 [3]
8 − 0.2 11.8 ± 0.05 –4.6 ± 1.4 11.6 ± 2.4 7.0 ± 2.0 0.70 ± 0.15 [3]
8.1 + 0.2 3.5 ± 0.10 –8.5 ± 1.8 15.0 ± 2.2 7.0 ± 2.0 0.60 ± 0.08 [3]
12.7 − 0.2 4.8 ± 0.04 –9.4 ± 1.2 13.9 ± 1.6 4.5 ± 1.0 0.59 ± 0.07 [3]
12.8 − 0.2 3.8 ± 0.06 –9.3 ± 1.2 15.3 ± 1.6 6.0 ± 1.0 0.63 ± 0.06 [3]
12.8 + 0.4 13.9 ± 0.09 –4.5 ± 1.2 11.5 ± 2.3 7.0 ± 2.0 0.81 ± 0.16 [3]
12.9 − 0.2 3.7 ± 0.06 –6.0 ± 1.2 12.1 ± 1.6 6.1 ± 1.0 0.49 ± 0.06 [3]
13.9 − 0 13.1 ± 0.07 –5.8 ± 1.3 12.8 ± 2.4 7.0 ± 2.0 0.85 ± 0.16 [3]
14 − 0.1 3.6 ± 0.06 –7.0 ± 1.3 12.6 ± 1.7 5.5 ± 1.0 0.51 ± 0.07 [3]
14.2 − 0.2 3.7 ± 0.06 –4.4 ± 1.4 11.4 ± 2.4 7.0 ± 2.0 0.47 ± 0.10 [3]
14.4 − 0.1 12.7 ± 0.06 –9.0 ± 1.4 16.0 ± 2.4 7.0 ± 2.0 1.04 ± 0.16 [3]
15.1 − 0.7 2.1 ± 0.09 –7.3 ±2.3 13.2 ± 2.5 5.9 ± 1.0 0.51 ± 0.10 [3]
15.2 − 0.6 1.8 ± 0.10 –8.0 ± 2.3 17.5 ± 2.5 9.5 ± 1.0 0.66 ± 0.09 [3]
16.9 + 0.8 2.7 ± 0.07 –8.1 ± 1.4a 14.2 ± 1.6 6.1 ± 1.0 0.56 ± 0.06 [3]
17.0 + 0.8 2.5 ± 0.07 –7.0 ± 1.6 13.1 ± 1.9 6.1 ± 1.0 0.52 ± 0.08 [3]
17.0 + 0.9 2.7 ± 0.07 –10.0 ± 1.6 18.1 ± 1.9 8.1 ± 1.0 0.72 ± 0.08 [3]
18.3 − 0.3 4.0 ± 0.05 –4.2 ± 1.3 9.5 ± 1.8 5.3 ± 1.0 0.40 ± 0.07 [3]
18.3 + 1.9 2.8 ± 0.07 –5.6 ± 1.5 11.4 ± 1.8 5.8 ± 1.0 0.46 ± 0.07 [3]
18.7 + 2.0 2.5 ± 0.07 –6.0 ± 1.5 13.0 ± 2.5 7.0 ± 2.0 0.51 ± 0.10 [3]
18.9 − 0.5 4.6 ± 0.04 –3.8 ± 1.2 9.7 ± 1.6 5.9 ± 1.0 0.42 ± 0.07 [3]
18.9 − 0.4 4.7 ± 0.04 –9.2 ± 1.2 14.7 ± 1.6 5.5 ± 1.0 0.63 ± 0.07 [3]
19.0 − 0.0 4.0f ± 0.07 –3.3 ± 1.2 8.5 ± 1.6 5.2 ± 1.0 0.35 ± 0.07 [3]
19.1 − 0.3 4.6 ± 0.04 –6.3 ± 1.2 10.4 ± 1.6 4.1 ± 1.0 0.45 ± 0.07 [3]
20.3 − 0.9 12.3 ± 0.05 –3.6 ± 1.1 10.6 ± 2.3 7.0 ± 2.0 0.69 ± 0.15 [3]
22.9 − 0.3 11.1 ± 0.04 –5.2 ± 1.1 10.3 ± 1.5 5.1 ± 1.0 0.62 ± 0.09 [3]
23.0 − 0.4 10.9 ± 0.04 –4.0 ± 1.1 11.8 ± 1.5 7.8 ± 1.0 0.71 ± 0.09 [3]
24.2 + 0.2 9.3 ± 0.05 –4.1 ± 1.3 11.1 ± 2.4 7.0 ± 2.0 0.61 ± 0.13 [3]
24.4 + 0.1 6.2 ± 0.05 –5.1 ± 1.3 10.6 ± 1.6 5.5 ± 1.0 0.50 ± 0.08 [3]
24.5 + 0.2 6.5 ± 0.05 –6.1 ± 1.3 10.8 ± 1.7 4.7 ± 1.0 0.51 ± 0.08 [3]
24.7 − 0.2 10.3 ± 0.04 –8.4 ± 1.3 14.1 ± 1.7 5.7 ± 1.0 0.82 ± 0.10 [3]
24.8 − 0.1 6.2 ± 0.05 –6.2 ± 1.3 13.2 ± 2.4 7.0 ± 2.0 0.62 ± 0.11 [3]
24.8 + 0.1 6.1 ± 0.05 –9.8 ± 1.4 14.7 ± 1.7 5.0 ± 1.0 0.69 ± 0.08 [3]
25.3 − 0.3 11.2 ± 0.05 –7.6 ± 1.5 13.3 ± 1.8 5.7 ± 1.0 0.82 ± 0.11 [3]
25.4 − 0.3 11.2 ± 0.05 –8.0 ± 1.5 16.1 ± 1.8 8.1 ± 1.0 1.00 ± 0.11 [3]
25.4 − 0.2 11.4 ± 0.05 –8.3 ± 1.5 14.3 ± 1.8 6.0 ± 1.0 0.90 ± 0.11 [3]
348.6 − 0.6 2.7 ± 0.10 –8.2 ± 0.9 13.0 ± 1.4 4.8 ± 1.0 0.51 ± 0.05 [3]
348.7 − 1 2.0 ± 0.12 –3.3 ± 0.9 9.5 ± 1.4 6.2 ± 1.0 0.36 ± 0.05 [3]
351.5 − 0.5 3.3 ± 0.10 –3.2 ± 1.0 8.9 ± 1.4 5.7 ± 1.0 0.36 ± 0.06 [3]
354.2 − 0.1 5.1 ± 0.06 –4.9 ± 1.3 10.2 ± 1.6 5.3 ± 1.0 0.44 ± 0.07 [3]
339.18 − 0.42 3.0 ± 0.4 –14.98 ± 3.57 32.86 ± 5.91 5.6 ± 1.0 1.33 ± 0.24 [4]
338.95 + 0.59 2.1 ± 0.3 –1.22 ± 0.53 13.12 ± 3.3 7.0 ± 2.0 0.51 ± 0.13 [4]
336.52 − 1.50 1.8 ± 0.3 –0.57 ± 0.29 12.09 ± 3.23 7.0 ± 2.0 0.47 ± 0.13 [4]
336.59 − 1.81 2.5 ± 0.7 –0.04 ± 0.19 11.24 ± 3.21 7.0 ± 2.0 0.45 ± 0.13 [4]
335.78 + 0.01 2.2 ± 0.3 –1.79 ± 0.81 14.03 ± 3.45 7.0 ± 2.0 0.56 ± 0.14 [4]
333.71 − 0.46 11.8 ± 0.4 –3.08 ± 2.05 8.91 ± 3.65 2.5 ± 1.0 0.58 ± 0.24 [4]
333.61 − 0.09 3.0 ± 0.5 –2.31 ± 1.03 14.87 ± 3.59 7.0 ± 2.0 0.61 ± 0.15 [4]
333.64 − 0.22 3.2 ± 0.4 –3.06 ± 0.81 14.79 ± 2.05 6.2 ± 1.0 0.61 ± 0.09 [4]
333.33 − 0.39 2.7 ± 0.3 –2.7 ± 0.86 15.48 ± 3.48 7.0 ± 2.0 0.63 ± 0.14 [4]
333.29 − 0.30 3.3 ± 1.1 –11.19 ± 2.8 29.03 ± 5.49 7.0 ± 2.0 1.21 ± 0.24 [4]
333.20 − 0.10 2.4 ± 0.3 –1.49 ± 0.6 13.55 ± 3.33 7.0 ± 2.0 0.55 ± 0.13 [4]
333.04 + 2.03 1.6 ± 0.6 –2.01 ± 0.8 12.94 ± 2.05 6.1 ± 1.0 0.51 ± 0.08 [4]
333.07 + 0.02 2.5 ± 1.1 –5.51 ± 2.36 19.97 ± 4.94 7.0 ± 2.0 0.81 ± 0.2 [4]
333.06 − 0.45 3.0 ± 0.3 –0.91 ± 0.35 12.63 ± 3.24 7.0 ± 2.0 0.52 ± 0.13 [4]
333.01 − 0.62 3.1 ± 1.1 –5.07 ± 1.59 19.27 ± 4.07 7.0 ± 2.0 0.8 ± 0.17 [4]
332.98 + 1.78 2.1 ± 1.4 –0.71 ± 0.39 12.3 ± 3.25 7.0 ± 2.0 0.49 ± 0.13 [4]
331.15 − 0.52 4.3 ± 0.4 –1.03 ± 0.45 8.82 ± 1.75 4.5 ± 1.0 0.39 ± 0.08 [4]
330.89 − 0.37 3.7 ± 0.4 –0.16 ± 0.16 8.07 ± 1.62 4.9 ± 1.0 0.35 ± 0.07 [4]
329.36 + 0.12 7.3 ± 0.1 –0.79 ± 1.57 12.91 ± 2.98 7.3 ± 1.0 0.66 ± 0.15 [4]
327.18 − 0.60 2.9 ± 1.0 –1.39 ± 0.36 13.39 ± 3.24 7.0 ± 2.0 0.56 ± 0.14 [4]
326.67 + 0.57 2.4 ± 0.3 –1.68 ± 0.62 13.85 ± 3.34 7.0 ± 2.0 0.57 ± 0.14 [4]
326.23 + 0.72 3.0 ± 0.4 –0.47 ± 0.18 8.74 ± 1.62 5.0 ± 1.0 0.37 ± 0.07 [4]
322.19 + 0.57 1.8 ± 0.9 –0.39 ± 0.39 11.79 ± 3.25 7.0 ± 2.0 0.49 ± 0.14 [4]
321.15 − 0.55 3.8 ± 0.5 –0.83 ± 1.25 8.51 ± 2.55 4.5 ± 1.0 0.39 ± 0.12 [4]
318.19 − 0.59 1.7 ± 0.3 –0.43 ± 0.18 11.86 ± 3.21 7.0 ± 2.0 0.5 ± 0.13 [4]
317.62 − 0.40 1.9 ± 0.6 –0.55 ± 1.09 12.05 ± 3.64 7.0 ± 2.0 0.51 ± 0.16 [4]
317.33 + 0.26 2.5 ± 0.3 –0.48 ± 0.25 11.95 ± 3.22 7.0 ± 2.0 0.52 ± 0.14 [4]
317.988 − 00.754 3.6 ± 1.1 –1.33 ± 0.28 9.47 ± 0.74 4.6 ± 0.37 0.43 ± 0.04 [5]
322.036 + 00.625 3.5 ± 3.5 –0.52 ± 0.23 12.47 ± 0.64 7.29 ± 0.33 0.55 ± 0.09 [5]
322.220 + 00.504 3.5 ± 3.5 –0.38 ± 0.28 12.25 ± 0.69 7.29 ± 0.33 0.54 ± 0.09 [5]
326.270 + 00.783 3.0 ± 0.4 –2.56 ± 0.58 15.79 ± 1.07 7.33 ± 0.33 0.67 ± 0.05 [5]
326.643 + 00.514 3.0 ± 0.4 –1.35 ± 0.58 13.84 ± 1.07 7.32 ± 0.33 0.59 ± 0.05 [5]
327.300 − 00.548 3.2 ± 0.4 –1.99 ± 0.42 12.92 ± 0.89 6.1 ± 0.36 0.55 ± 0.04 [5]
327.991 − 00.087 3.6 ± 1.8 –0.79 ± 0.35 10.84 ± 0.81 6.0 ± 0.36 0.47 ± 0.05 [5]
328.572 − 00.527 3.4 ± 0.4 –2.38 ± 0.38 15.28 ± 0.81 7.19 ± 0.33 0.65 ± 0.04 [5]
331.365 + 00.521 11.8 ± 5.9 –3.3 ± 0.52 12.93 ± 1.0 4.8 ± 0.34 0.85 ± 0.33 [5]
332.145 − 00.452 3.7 ± 0.4 –1.64 ± 0.28 13.87 ± 0.68 7.05 ± 0.32 0.59 ± 0.03 [5]
332.657 − 00.622 3.3 ± 0.4 –2.1 ± 0.78 14.77 ± 1.34 7.15 ± 0.32 0.62 ± 0.06 [5]
332.762 − 00.595 3.8 ± 0.4 –2.12 ± 0.78 14.58 ± 1.34 7.01 ± 0.32 0.62 ± 0.06 [5]
332.978 + 00.773 3.8 ± 0.5 –2.25 ± 0.33 9.98 ± 0.76 4.0 ± 0.35 0.43 ± 0.03 [5]
333.011 − 00.441 3.6 ± 0.4 –1.89 ± 0.47 14.29 ± 0.9 7.06 ± 0.32 0.61 ± 0.04 [5]
333.093 + 01.966 1.6 ± 0.6 –1.13 ± 0.48 14.05 ± 0.95 7.67 ± 0.35 0.55 ± 0.04 [5]
333.627 − 00.199 3.2 ± 0.4 –3.51 ± 0.54 17.03 ± 1.0 7.16 ± 0.32 0.71 ± 0.04 [5]
337.957 − 00.474 3.1 ± 1.6 –1.13 ± 0.38 10.74 ± 0.83 5.6 ± 0.35 0.44 ± 0.04 [5]
338.706 + 00.645 4.3 ± 0.4 –2.5 ± 0.59 14.78 ± 1.07 6.76 ± 0.31 0.63 ± 0.05 [5]
338.911 + 00.615 4.4 ± 0.4 –2.67 ± 0.59 15.01 ± 1.07 6.73 ± 0.31 0.64 ± 0.05 [5]
338.934 − 00.067 3.2 ± 0.4 –2.36 ± 0.42 15.1 ± 0.85 7.1 ± 0.32 0.62 ± 0.04 [5]
339.109 − 00.233 6.5 ± 3.3 –2.05 ± 0.58 9.98 ± 1.06 4.2 ± 0.32 0.47 ± 0.09 [5]
339.134 − 00.377 3.0 ± 0.4 –3.47 ± 0.58 16.97 ± 1.06 7.16 ± 0.32 0.69 ± 0.04 [5]
340.216 + 00.424 4.4 ± 2.2 –2.77 ± 0.59 12.09 ± 1.08 4.8 ± 0.33 0.52 ± 0.07 [5]
340.678 − 01.049 2.3 ± 2.3 –2.25 ± 0.57 15.37 ± 1.05 7.38 ± 0.33 0.6 ± 0.07 [5]
340.780 − 01.022 2.3 ± 0.6 –2.6 ± 0.57 15.93 ± 1.05 7.38 ± 0.33 0.62 ± 0.04 [5]
340.862 − 00.870 2.3 ± 2.3 –1.47 ± 0.47 14.13 ± 0.91 7.38 ± 0.33 0.55 ± 0.06 [5]
341.090 − 00.017 3.2 ± 3.2 –2.75 ± 0.3 15.68 ± 0.7 7.07 ± 0.32 0.64 ± 0.09 [5]
342.277 + 00.311 9.6 ± 4.8 –3.22 ± 0.66 11.37 ± 1.18 3.9 ± 0.32 0.62 ± 0.17 [5]
343.480 − 00.043 13.4 ± 7.4 –2.22 ± 0.42 16.48 ± 0.88 8.1 ± 0.35 1.13 ± 0.57 [5]
343.914 − 00.646 2.8 ± 1.4 –0.94 ± 0.33 13.0 ± 0.76 7.2 ± 0.35 0.52 ± 0.04 [5]
345.094 − 00.779 2.1 ± 2.1 –3.59 ± 0.62 17.59 ± 1.13 7.43 ± 0.33 0.68 ± 0.07 [5]
345.202 + 01.027 1.1 ± 0.6 –4.13 ± 1.22 14.26 ± 1.95 4.8 ± 0.12 0.53 ± 0.07 [5]
345.235 + 01.408 8.0 ± 4.0 –1.94 ± 0.68 12.68 ± 1.22 6.0 ± 0.35 0.63 ± 0.14 [5]
345.410 − 00.953 2.6 ± 0.6 –2.26 ± 0.81 14.72 ± 1.29 6.96 ± 0.05 0.58 ± 0.05 [5]
348.261 + 00.485 1.8 ± 1.8 –3.74 ± 0.64 17.99 ± 1.15 7.53 ± 0.34 0.68 ± 0.06 [5]
348.691 − 00.826 3.4 ± 0.3 –1.24 ± 0.66 9.64 ± 1.92 4.8 ± 1.0 0.39 ± 0.08 [5]
348.710 − 01.044 3.4 ± 0.3 –1.97 ± 0.57 13.04 ± 1.83 6.2 ± 1.0 0.52 ± 0.07 [5]
350.991 − 00.532 13.7 ± 6.9 –1.62 ± 0.62 12.33 ± 1.14 6.1 ± 0.35 0.84 ± 0.4 [5]
350.995 + 00.654 0.6 ± 0.3 –6.76 ± 1.34 27.67 ± 2.21 10.57 ± 0.34 1.0 ± 0.08 [5]
351.130 + 00.449 1.4 ± 0.7 –7.62 ± 1.64 22.78 ± 2.62 6.65 ± 0.07 0.85 ± 0.1 [5]
351.311 + 00.663 1.3 ± 0.1 –6.84 ± 0.69 23.23 ± 1.24 7.71 ± 0.35 0.86 ± 0.05 [5]
351.383 + 00.737 1.3 ± 0.1 –7.43 ± 0.68 27.35 ± 1.09 9.7 ± 0.09 1.01 ± 0.04 [5]
351.516 − 00.540 3.3 ± 3.3 –3.9 ± 0.68 15.33 ± 1.93 5.7 ± 1.0 0.61 ± 0.11 [5]
351.688 − 01.169 14.2 ± 1.0 –3.05 ± 0.49 15.23 ± 0.86 6.49 ± 0.21 1.07 ± 0.1 [5]
353.038 + 00.581 1.1 ± 1.1 –5.39 ± 1.12 21.03 ± 1.87 7.78 ± 0.35 0.77 ± 0.08 [5]
353.076 + 00.287 0.7 ± 1.5 –6.72 ± 1.5 19.33 ± 2.4 5.39 ± 0.1 0.7 ± 0.09 [5]
353.092 + 00.857 1.0 ± 2.0 –5.72 ± 1.12 20.47 ± 1.89 7.1 ± 0.4 0.75 ± 0.09 [5]

Notes. Column (1): galactic coordinates. Column (2): distance from the Sun to the HII region. Column (3): sky brightness temperature derived from the measured intensity at the observing frequency. Column (4): synchrotron brightness temperature of the column in front of the HII region (first 9 entries), and the synchrotron brightness temperature of the column behind the HII region (entries 10 and onward). Column (5): electron temperature of the HII region. Column (6): emissivity of the column in front of the HII regions (first 9 entries) and behind the HII region (entries 10 and onward). (a) The HII region was observed in different fields. The weighted mean for this HII region is calculated from the different measurements and is given in this table. This weighted mean was also used in our modeling effort. (b) Observed values not given in original paper; values calculated here. (c)Uncertainty absent in paper, as discussed in Sect. 4.1; we adopted 1.0 × 103 K. (d) Electron temperatures updated with values from Azcárate et al. (1990). (e)No error on the distance was provided by Paper 2 or references therein. A 10% uncertainty was assumed. (f) Distance as calculated from the radial velocities in Paladini et al. (2003) different from cited distance in Paper 3. The new calculated value was adopted.

References. [1] Jones & Finlay (1974), [2] Roger et al. (1999), [3] Nord et al. (2006), [4] Hindson et al. (2016) and [5] Su et al. (2016).

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