Table 2: Properties of candidate late-O stars. The last two lines reproduces the data of two eclipsing binaries (from Rauw et al. 2007).
Name RA, Dec (J2000) $V \pm\sigma_V$ $B-V \pm\sigma_{B-V}$

MSP32 10:24:03.78, -57:44:39.8 15.355 $\pm$ 0.010 1.285 $\pm$ 0.014

MSP120 10:23:58.44, -57:45:13.0 16.211 $\pm$ 0.009 1.539 $\pm$ 0.016

MSP165 10:23:55.18, -57:45:26.9 15.604 $\pm$ 0.009 1.602 $\pm$ 0.013

MSP168 10:24:01.61, -57:45:27.8 14.829 $\pm$ 0.031 1.260 $\pm$ 0.039

MSP441 10:24:01.45, -57:45:31.3 14.918 $\pm$ 0.091 1.283 $\pm$ 0.138

Src 1 10:24:21.28, -57:47:27.6 14.671 $\pm$ 0.022 1.412 $\pm$ 0.025

Src 2 10:24:16.25, -57:43:43.8 14.914 $\pm$ 0.015 1.597 $\pm$ 0.017

Src 3 10:24:06.64, -57:47:15.8 16.473 $\pm$ 0.011 1.644 $\pm$ 0.019

Src 4 10:24:02.28, -57:45:35.3 13.302 $\pm$ 0.039 1.371 $\pm$ 0.059

MSP44 10:24:00.5, -57:44:45 15.67 1.25

MSP223 10:23:59.2, -57:45:40 15.75 1.50

**Table 2:** Properties of candidate late-O stars. The last two lines reproduces the data of two eclipsing binaries (from Rauw et al. 2007).
Name	RA, Dec (J2000)	$V \pm\sigma_V$	$B-V \pm\sigma_{B-V}$
MSP32	10:24:03.78, -57:44:39.8	15.355 $\pm$ 0.010	1.285 $\pm$ 0.014
MSP120	10:23:58.44, -57:45:13.0	16.211 $\pm$ 0.009	1.539 $\pm$ 0.016
MSP165	10:23:55.18, -57:45:26.9	15.604 $\pm$ 0.009	1.602 $\pm$ 0.013
MSP168	10:24:01.61, -57:45:27.8	14.829 $\pm$ 0.031	1.260 $\pm$ 0.039
MSP441	10:24:01.45, -57:45:31.3	14.918 $\pm$ 0.091	1.283 $\pm$ 0.138
Src 1	10:24:21.28, -57:47:27.6	14.671 $\pm$ 0.022	1.412 $\pm$ 0.025
Src 2	10:24:16.25, -57:43:43.8	14.914 $\pm$ 0.015	1.597 $\pm$ 0.017
Src 3	10:24:06.64, -57:47:15.8	16.473 $\pm$ 0.011	1.644 $\pm$ 0.019
Src 4	10:24:02.28, -57:45:35.3	13.302 $\pm$ 0.039	1.371 $\pm$ 0.059
MSP44	10:24:00.5, -57:44:45	15.67	1.25
MSP223	10:23:59.2, -57:45:40	15.75	1.50

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