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Table 1

Observational circumstances.

Objects Date obs. (UT) Exptime (s) Airmass range

Quaoar01 2013-08-05T01:32 4 × 900 1.014–1.066
Quaoar02 2013-08-05T02:45 4 × 900 1.078–1.240
SA110361 2013-08-05T03:56 4 × 30 1.185–1.200
HD147284 2013-08-08T00:43 4 × 3 1.016–1.020
Quaoar03 2013-08-08T00:58 4 × 900 1.013–1.039
Quaoar04 2013-08-08T02:10 8 × 600 1.047–1.253
SA110361 2013-08-08T03:48 4 × 30 1.192–1.207

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