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Table 2

Observing log.

ID V Date Exp. time S / N
[mag] [s] [px-1]

M 4
19925 11.04 Jun. 23/24 2013 8 × 60 220
21191 11.70 Sep. 13/14 2013 8 × 120 230
27448 11.73 Sep. 13/14 2013 8 × 120 230
28103 10.71 Apr. 5/6 2013 6 × 60 240
34006 11.87 Sep. 6/7 2013 8 × 120 160
36215 11.80 Sep. 6/7 2013 8 × 120 140
M 22
200005 10.92 Jun. 19/20 2013 8 × 60 230
200025 11.52 Jun. 19/20 2013 12 × 60 190
200031 11.64 Jun. 19/20 2013 8 × 120 180
200051 12.04 Jun. 20/21 2013 10 × 120 140
200061 12.21 Aug. 9/10 2013 14 × 180 100
200068 12.30 Aug. 10/11 2013 16 × 120 170
M 30
5783a 12.71 Jul. 27/28 2013 8 × 300 140
5783a 12.71 Aug. 22/23 2013 8 × 300 140
10849 12.55 Jul. 27/28 2013 12 × 300 100
11294 12.09 Aug. 22/23 2013 6 × 300 220

Notes.

(a)

This star was observed in two nights. The stated S/N is for the combined spectrum of all 16 × 300 s exposures.

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