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Table A.1.

Observed coordinates, line-of-sight velocities, observing times, frequency of the maser transition of our targets, and the VLBA program code of the corresponding observation.

Source RA Dec vLSR Observing times Frequency VLBA
[hh mm ss.ssss] [dd mm ss.sss] [km s−1] [GHz] program code
G023.25−00.24 18 34 31.2392 −08 42 47.501 65 Oct. 2012−Oct. 2013 6.7 BR149F
J1825−0737 18 25 37.6096 −07 37 30.013
J1846−0651 18 46 06.3002 −06 51 27.747
G028.14−00.00 18 42 42.5916 −04 15 35.163 101 Oct. 2012−Oct. 2013 6.7 BR149H
J1833−0323 18 33 23.9055 −03 23 31.466
J1834−0301 18 34 14.0746 −03 01 19.627
J1827−0405 18 27 45.0404 −04 05 44.580
J1846−0651 18 46 06.3002 −06 51 27.747
G028.86+00.06 18 43 46.2259 −03 35 29.563 106 Feb. 2011−Apr. 2012 22 BR145J
J1833−0323 18 33 23.9055 −03 23 31.466
J1846−0651 18 46 06.3003 −06 51 27.746
J1857−0048 18 57 51.3586 −00 48 21.950
G029.86−00.04 18 45 59.5734 −02 45 05.528 102 Oct. 2012−Oct. 2013 6.7 BR149I
J1834−0301 18 34 14.0746 −03 01 19.627
J1833−0323 18 33 23.9055 −03 23 31.466
J1857−0048 18 57 51.3586 −00 48 21.950
J1846−0003 18 46 03.7826 −00 03 38.283
G029.95−00.01 18 46 03.7431 −02 39 20.999 96 Oct. 2012−Oct. 2013 6.7 BR149I
J1834−0301 18 34 14.0746 −03 01 19.627
J1853−0048 18 53 41.9892 −00 48 54.331
J1833−0323 18 33 23.9055 −03 23 31.466
J1846−0003 18 46 03.7826 −00 03 38.283
G029.98+00.10 18 45 39.9637 −02 34 32.624 118 Nov. 2013−Apr. 2015 22 BR198N
J1834−0301 18 34 14.0746 −03 01 19.627
J1853−0048 18 53 41.9892 −00 48 54.330
J1846−0003 18 46 03.7850 −00 03 38.280
J1857−0048 18 57 51.3586 −00 48 21.950
G030.22−00.18 18 47 08.2900 −02 29 29.400 113 Apr. 2014−Apr. 2015 6.7 BR198M
J1853−0048 18 53 41.9892 −00 48 54.330
J1857−0048 18 57 51.3586 −00 48 21.950
J1846−0003 18 46 03.7850 −00 03 38.280
J1834−0301 18 34 14.0746 −03 01 19.627
G030.41−00.23 18 47 40.7610 −02 20 30.254 103 Oct. 2012−Oct. 2013 6.7 BR149J
J1853−0048 18 53 41.9892 −00 48 54.331
J1834−0301 18 34 14.0746 −03 01 19.627
J1857−0048 18 57 51.3586 −00 48 21.950
J1846−0003 18 46 03.7826 −00 03 38.283
G030.70−00.06 18 47 36.8036 −02 00 55.021 88 Oct. 2012−Oct. 2013 6.7 BR149J
J1853−0048 18 53 41.9892 −00 48 54.331
J1834−0301 18 34 14.0746 −03 01 19.627
J1857−0048 18 57 51.3586 −00 48 21.950
J1846−0003 18 46 03.7826 −00 03 38.283
G030.74−00.04 18 47 37.7289 −01 57 54.699 88 Oct. 2012−Oct. 2013 6.7 BR149K
J1853−0048 18 53 41.9892 −00 48 54.331
J1834−0301 18 34 14.0746 −03 01 19.627
J1857−0048 18 57 51.3586 −00 48 21.950
J1846−0003 18 46 03.7826 −00 03 38.283
G030.78+00.20 18 46 48.0800 −01 48 54.000 87 Apr. 2014−Apr. 2015 6.7 BR198M
J1853−0048 18 53 41.9892 −00 48 54.330
J1857−0048 18 57 51.3586 −00 48 21.950
J1833−0323 18 33 23.9055 −03 23 31.466
J1834−0301 18 34 14.0746 −03 01 19.627
G030.81−00.05 18 47 46.9764 −01 54 26.676 109 Oct. 2012−Oct. 2013 6.7 BR149K
J1853−0048 18 53 41.9892 −00 48 54.331
J1834−0301 18 34 14.0746 −03 01 19.627
J1857−0048 18 57 51.3586 −00 48 21.950
J1846−0003 18 46 03.7826 −00 03 38.283
G030.97−00.14 18 48 22.0300 −01 48 30.600 78 Apr. 2014−Apr. 2015 6.7 BR198M
J1857−0048 18 57 51.3586 −00 48 21.950
J1853−0048 18 53 41.9892 −00 48 54.330
J1846−0003 18 46 03.7850 −00 03 38.280
G031.41+00.30 18 47 34.3124 −01 12 47.000 98 Nov. 2013−Apr. 2015 22 BR198N
J1853−0048 18 53 41.9892 −00 48 54.330
J1846−0003 18 46 03.7850 −00 03 38.280
J1853−0010 18 53 10.2692 −00 10 50.740
J1857−0048 18 57 51.3586 −00 48 21.950
G032.04+00.05 18 49 36.5732 −00 45 42.650 99 Nov. 2012−Oct. 2013 6.7 BR149L
J1853−0048 18 53 41.9892 −00 48 54.331
J1857−0048 18 57 51.3586 −00 48 21.950
J1846−0003 18 46 03.7826 −00 03 38.283
J1848+0138 18 48 21.8104 +01 38 26.632
G033.09−00.07 18 51 59.4085 +00 06 34.262 104 Nov. 2012−Oct. 2013 6.7 BR149L
J1853−0048 18 53 41.9892 −00 48 54.331
J1857−0048 18 57 51.3586 −00 48 21.950
J1846−0003 18 46 03.7826 −00 03 38.283
J1848+0138 18 48 21.8104 +01 38 26.632

Notes. The J* sources are the background quasars that were observed as phase reference sources for the corresponding target.

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