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Table A.1.

Maximum likelihood and Kalkayotl estimates for the distances for samples excluding stars with RUWE > 1.4.

Group outlier exclusion: ML parallax ML distance Kalkayotl distance
fore- back- ϖML DML 2σ-range DKal central 68.3% quant.
ground [mas] [kpc] [kpc]
Carina Neb. 3σ 1 2 0.42457 ± 0.00156 2.355 [2.338 ,  2.373] 2.366 [2.310 ,  2.422]
OB stars 2σ 2 3 0.42457 ± 0.00158 2.355 [2.338 ,  2.373] 2.367 [2.312 ,  2.423]
(N = 113) 1σ 3 8 0.42567 ± 0.00160 2.349 [2.332 ,  2.367] 2.363 [2.308 ,  2.418]

NGC 3324 3σ 0 0 0.43585 ± 0.00735 2.294 [2.219 ,  2.374] 2.338 [2.267 ,  2.410]
OB stars 2σ 0 0 0.43585 ± 0.00735 2.294 [2.219 ,  2.374] 2.338 [2.267 ,  2.410]
(N = 4) 1σ 0 0 0.43585 ± 0.00735 2.294 [2.219 ,  2.374] 2.338 [2.267 ,  2.410]

NGC 3293 3σ 1 1 0.42539 ± 0.00178 2.351 [2.331 ,  2.371] 2.354 [2.298 ,  2.410]
OB stars 2σ 1 1 0.42539 ± 0.00178 2.351 [2.331 ,  2.371] 2.354 [2.298 ,  2.410]
(N = 96) 1σ 2 1 0.42471 ± 0.00179 2.355 [2.335 ,  2.375] 2.357 [2.302 ,  2.412]

All 3σ 2 3 0.42520 ± 0.00116 2.352 [2.339 ,  2.365] 2.362 [2.308 ,  2.416]
OB stars 2σ 3 4 0.42521 ± 0.00117 2.352 [2.339 ,  2.365] 2.363 [2.308 ,  2.419]
(N = 213) 1σ 5 9 0.42552 ± 0.00118 2.350 [2.337 ,  2.363] 2.362 [2.306 ,  2.416]

CCCP 3σ 732 132 0.43052 ± 0.00066 2.323 [2.316 ,  2.330] 2.343 [2.290 ,  2.397]
X-ray 2σ 934 418 0.42997 ± 0.00068 2.326 [2.318 ,  2.333] 2.339 [2.286 ,  2.392]
(N = 7590) 1σ 1569 1280 0.43000 ± 0.00071 2.326 [2.318 ,  2.333] 2.331 [2.278 ,  2.385]

NGC 3324 3σ 52 9 0.42379 ± 0.00284 2.360 [2.328 ,  2.392] 2.345 [2.288 ,  2.403]
X-ray 2σ 65 19 0.42172 ± 0.00287 2.371 [2.339 ,  2.404] 2.358 [2.300 ,  2.416]
(N = 410) 1σ 96 51 0.42379 ± 0.00306 2.360 [2.326 ,  2.394] 2.357 [2.299 ,  2.414]

NGC 3293 3σ 46 5 0.43160 ± 0.00221 2.317 [2.293 ,  2.341] 2.344 [2.289 ,  2.399]
X-ray 2σ 56 23 0.43219 ± 0.00222 2.314 [2.290 ,  2.338] 2.340 [2.284 ,  2.395]
(N = 548) 1σ 100 75 0.43130 ± 0.00227 2.319 [2.294 ,  2.343] 2.340 [2.284 ,  2.396]

All 3σ 830 146 0.43028 ± 0.00062 2.324 [2.317 ,  2.331] 2.341 [2.287 ,  2.395]
X-ray 2σ 1055 460 0.42974 ± 0.00064 2.327 [2.320 ,  2.334] 2.337 [2.284 ,  2.391]
(N = 8548) 1σ 1765 1406 0.42982 ± 0.00066 2.327 [2.319 ,  2.334] 2.331 [2.278 ,  2.384]

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