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Table 1

Log of SPHERE observations.

Date UT-Time Instrument Neutral DIT × NDIT × NEXP Δ PA ⟨Seeing⟩ Airmass τ0 Notes
(hh:mm) density (IRDIS/IFS) (°) (′′) (ms)
06-05-2015 02:28 IRDIFS ND_3.5 8∕16 s × 8∕4 × 1∕1 0.46 1.63 1.22 0.9 unsat
06-05-2015 02:39 IRDIFS none 4∕16 s × 2∕2 × 1∕1 0.07 1.72 1.21 0.9 waffles
06-05-2015 02:41 IRDIFS none 4∕16 s × 56∕16 × 16∕16 29.32 0.89 1.21 1.9
06-05-2015 03:59 IRDIFS none 4∕16 s × 2∕2 × 1∕1 0.07 0.83 1.24 1.9 waffles
06-05-2015 04:00 IRDIFS ND_3.5 8∕16 s × 8∕4 × 1∕1 0.43 0.71 1.24 2.2 unsat

03-06-2015 00:32 IRDIFS ND_2.0 0.84∕2 s × 16∕8 × 1∕1 0.18 1.53 1.23 2.9 unsat
03-06-2015 00:33 IRDIFS none 16∕16 s × 2∕2 × 1∕1 0.23 1.67 1.23 2.7 waffles
03-06-2015 00:34 IRDIFS none 16∕16 s × 16∕16 × 16∕16 28.77 1.30 1.21 2.8
03-06-2015 01:54 IRDIFS none 16∕16 s × 2∕2 × 1∕1 0.23 1.11 1.23 4.7 waffles
03-06-2015 01:56 IRDIFS ND_2.0 0.84∕2 s × 16∕8 × 1 0.19 0.85 1.23 6.1 unsat

05-06-2015 00:50 IRDIFS_EXT ND_2.0 0.84∕2 s × 16∕8 × 1 0.20 1.47 1.21 1.9 unsat
05-06-2015 00:51 IRDIFS_EXT none 16∕16 s × 2∕2 × 1∕1 0.23 1.49 1.21 1.8 waffles
05-06-2015 00:54 IRDIFS_EXT none 16∕16 s × 16∕16 × 1∕1 27.88 1.79 1.22 1.39
05-06-2015 02:11 IRDIFS_EXT none 16∕16 s × 2∕2 × 1∕1 0.19 1.75 1.26 1.5 waffles
05-06-2015 02:13 IRDIFS_EXT ND_2.0 0.84∕2 s × 16∕8 × 1∕1 0.17 1.74 1.26 1.4 unsat

06-06-2015 00:41 IRDIS-Y2Y3 ND_3.5 4 s × 15 × 1 0.50 1.27 1.21 2.1 unsat
06-06-2015 00:44 IRDIS-Y2Y3 none 2 s × 3 × 1 0.05 1.30 1.21 2.2 waffles
06-06-2015 00:45 IRDIS-Y2Y3 none 2 s × 40 × 64 35.17 1.34 1.23 2.2
06-06-2015 01:49 IRDIS-Y2Y3 none 2 s × 3 × 1 0.06 1.42 1.23 2.1 waffles
06-06-2015 02:18 IRDIS-Y2Y3 none 2 s × 3 × 1 0.05 1.21 1.28 2.6 waffles
06-06-2015 00:41 IRDIS-Y2Y3 ND_3.5 4 s × 15 × 1 0.38 1.31 1.28 2.5 unsat

07-06-2015 00:56 IRDIS-J2J3 ND_2.0 4 s × 15 × 1 0.50 1.63 1.21 1.5 unsat
07-06-2015 00:59 IRDIS-J2J3 none 8 s × 3 × 1 0.19 1.42 1.21 1.7 waffles
07-06-2015 01:00 IRDIS-J2J3 none 8 s × 32 × 16 28.27 1.95 1.23 1.38
07-06-2015 02:21 IRDIS-J2J3 none 8 s × 3 × 1 0.14 2.55 1.30 1.2 waffles
07-06-2015 02:28 IRDIS-J2J3 ND_2.0 4 s × 15 × 1 0.35 2.33 1.32 1.3 unsat

29-03-2016 05:07 IRDIFS ND_3.5 8∕16 s × 21∕11 × 1∕1 1.25 1.29 1.21 1.7 unsat
29-03-2016 05:11 IRDIFS none 32∕32 s × 4∕4 × 26∕26 31.22 1.10 1.22 2.1 waffles
29-03-2016 06:07 IRDIFS ND_3.5 8∕16 s × 21∕11 × 1∕1 0.19 1.12 1.22 1.8 unsat

10-02-2017 08:05 IRDIFS ND_3.5 8∕16 s × 21∕11 × 1∕1 1.23 0.65 1.22 5.1 unsat
10-02-2017 08:09 IRDIFS none 32∕32 s × 4∕4 × 28∕28 31.17 0.78 1.22 3.4 waffles
10-02-2017 09:29 IRDIFS ND_3.5 8∕16 s × 21∕11 × 1∕1 1.12 0.93 1.24 2.6 unsat

Notes. UT-Time at start. The seeing is measured at 0.5 μm. DIT (detector integration time) refers to the individual exposure time per frame. NDIT is the number of individual frames per exposure, NEXP is the number of exposures, and ΔPA refers to the amplitude of the parallactic rotation.

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