Table 1: 6.7 GHz methanol maser properties.
Source NVSS Maser $(v_{\min},~v_{\max})$ $v_{\rm s}$ KDA d d' Quality $\sigma$
Name Source (km s-1) (km s-1) Resolution (kpc) (kpc) Assignment mJy beam-1
(1) (2) (3) (4) (5) (6) (7) (8) (9)
10.32-0.15a 180900-200456 (4, 17) 11.0 N $3.4 \pm 0.3$ $3.4 \pm 0.3$   8.0
10.47+0.02 180835-195219 (58, 77) 70.1 F $10.6 \pm +0.4$ $10.8 \pm 0.3$ A 5.3
10.62-0.38a 181028-195548 (-10, 7) 0.4 N $3.4 \pm 0.3$ $3.4 \pm 0.3$   1.5
10.95+0.02 180942-192629 (23, 25) 18.5 F $14.2^{\rm +1.3}_{-1.0}$ $14.3 \pm 1.2$ A 1.3
11.03+0.06 180939-192116 (15, 21) 12.6 F $15.0 \pm 1.3$ $15.0 \pm 1.3$ A 1.3
11.93-0.61 181401-185324 (30, 44) 39.3 N $4.2 \pm 0.8$ $4.0 \pm 0.7$ A 2.2
11.99-0.27 181245-184039 (60, 61) 58.2 F $11.3 \pm 0.6$ $11.5 \pm 0.6$ A 1.4
12.20-0.10A 181242-182417 (2, 15) 27.0 F $13.5 \pm 1.0$ $13.6^{\rm +1.0}_{-0.7}$ A 1.3
12.20-0.10B 181242-182417   53.6 F $11.6 \pm 0.6$ $11.8 \pm 0.6$ A 1.3
12.68-0.18 181355-180124 (50, 62) 57.4 N $5.1 \pm 0.6$ $4.9 \pm 0.6$ A 5.5
12.79-0.19 181414-175543 (31, 41) 35.8 N $3.8^{\rm +0.6}_{-0.9}$ $3.6 \pm 0.7$ A 2.5
12.90-0.26 181444-175223 (35, 47) 28.6 F $13.4 \pm 1.0$ $13.6 \pm 0.9$ A 2.5
13.18+0.06 181405-172832 (48, 49) 54.1 N $4.8 \pm 0.6$ $4.6 \pm 0.5$ A 2.5
14.09+0.10 181545-163858 (4, 17) 16.3 F $14.7 \pm 1.1$ $14.8 \pm 0.9$ A 1.5
18.06+0.08Ab 182335-130920   16.4 F? $14.7 \pm 0.9$ $14.8 \pm 0.8$ A 2.0
18.06+0.08Bb 182335-130920 (45, 57) 60.1 F? $11.7 \pm 0.5$ $11.9 \pm 0.4$ A 2.0
18.46-0.00 182436-125106 (47, 50) 56.5 F $11.9 \pm 0.5$ $12.1 \pm 0.4$ A 2.2
19.48+0.15 182604-115234 (20, 27) 19.8 F $14.4 \pm 0.8$ $14.5 \pm 0.7$ A 2.2
19.61-0.13 182716-115322 (52, 54) 58.6 F $11.8 \pm 0.5$ $12.0 \pm 0.4$ A 1.7
23.43-0.18 183438-083043 (94, 113) 104.5 F 9.2 $9.6 \pm 0.3$ B 3.3
24.50-0.03 183606-073106 (108, 116) 109.2 F 8.6 $9.3^{\rm +0.3}_{-0.5}$ A 1.5
24.67-0.14 183652-072453 (111, 114) 111.4 N 7.2 $6.4 \pm 0.5$ B 2.4
24.78+0.08 183610-071124 (106, 115) 108.6 N 6.8 $6.1 \pm 0.4$ B 1.6
25.70+0.04A 183804-062523   53.3 F $11.8 \pm 0.6$ $12.0 \pm 0.4$ A 1.0
25.70+0.04B ? (89, 101) 102.0 ? $\ldots$ $\ldots$   1.0
27.28+0.15 183610-071124 (34, 37) 36.3 F $12.7 \pm 0.7$ $12.9 \pm 0.5$ A 0.8
28.30-0.38Ac 184415-041757   44.8 F $12.1 \pm 0.6$ $12.3 \pm 0.5$ A 0.8
28.30-0.38Bc 184422-041746 (79, 93) 75.6 F $10.3 \pm 0.6$ $10.6 \pm 0.3$ A 0.8
30.70-0.07 184735-020143 (85, 90) 101.0 F 8.5 $9.0 \pm 0.4$ A 4.4
30.76-0.05 184738-015731 (88, 95) 91.6 F 8.5 $9.0 \pm 0.4$ B 4.4
30.82-0.05 184746-015451 (91, 110) 105.7 F 8.5 $9.0 \pm 0.4$ B 4.4
32.97+0.04 185124+000412 (89, 93) 93.2 F 8.3 $8.7 \pm 0.4$ B 2.0
33.13-0.09 185207+000819 (71, 81) 93.8 F 8.2 $8.7 \pm 0.4$ B 1.3
33.40+0.01A 185220+002552   72.3 F $9.8 \pm 0.7$ $10.0 \pm 0.4$ A 1.3
33.40+0.01B 185216+002531? (96, 107) 105.4 T 7.1 7.1 A 1.3
41.10-0.22 190711+070956 (63, 64) 59.4 F $9.1 \pm 0.8$ $9.4 \pm 0.4$ A 1.9
43.87-0.77 191426+092236 (47, 53) 55.0 F $8.8 \pm 0.8$ $9.1 \pm 0.5$ A 2.7
45.07+0.13 191320+105054 (57, 60) 63.0 F 7.7 $8.0 \pm 0.5$ B 1.4
48.90-0.27d 192214+140319 (63, 73) 66.5 ? $7.0 \pm 1.5$ $7.0 \pm 1.5$   1.4
50.29+0.69 192127+154406 (26, 33) 25.9 F $9.3 \pm 0.7$ $9.3 \pm 0.3$ A 1.3
81.87+0.78e 203837+423759 (0, 13) 1.7 F 2.0 1.2 B 2.9
Column (1) contains the source names. Sources which have two recombination line velocities in the same line of sight are suffixed A and B for distinction. Column (2) lists the NVSS source that is associated with the methanol maser. Column (3) shows the velocity extent of the maser emission, and Col. (4) shows the systemic velocity, $v_{\rm s}$ derived from the radio recombination line. Column (5) lists the KDA resolution specifying whether the source is at the near distance (N), far distance (F), tangent point (T), or whether the KDA is unresolved (?). Column (6) shows the distance d, calculated from the conventional method using the C85 rotation curve, while Col. (7) shows d', which is the modified kinematic distance calculated using the methodology described in Sect. 4. Column (8) indicates the quality of the KDA resolution (A or B), and Col. (9) lists the rms noise in the 21 cm continuum image. Errors for d are not listed when $v_{\rm s}+10$ exceeds the tangent point velocity, vt, since such velocities are forbidden, and cannot be converted to a meaningful distance.
a Distance from Blum et al. (2001); b Source has ambiguity between two recombination lines; c The continuum source associated with the A and B sources may be reversed; d Distance from Genzel et al. (1981); e d' for this source is the distance to the tangent point.

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