Table 1 Observational details of the acquired spectra and spectral slopes (see text for details)

	Spectrum	Date	Epoch (UT)	Exp time (s)	Telescope	Spectral slope (%/1000 Å)	Altitude (°)	Airmass	Mutual events
1	AF784959	18 Oct	02:11:11.9	900	Copernico	3.57 ± 1.47	29.9	2.001	SE
2	AF784960	18 Oct	02:32:31.9	900	Copernico	4.66 ± 1.63	31.9	1.886	SE
3	AF784961	18 Oct	02:50:44.5	900	Copernico	9.12 ± 1.77	33.4	1.811
4	AF784962	18 Oct	03:11:28.7	900	Copernico	9.12 ± 1.12	34.8	1.748
5	AF784963	18 Oct	03:29:23.0	900	Copernico	8.92 ± 2.44	35.7	1.710
6	AF784964	18 Oct	03:50:28.6	900	Copernico	6.21 ± 1.89	36.4	1.681
7	LBT1	18 Oct	11:40:03.6	300	LBT	8.02 ± 0.86	49.1	1.320
8	GTC1	19 Oct	05:06:14.0	180	GTC	12.33 ± 0.33	51.4	1.228
9	GTC2	19 Oct	05:09:38.0	180	GTC	11.49 ± 0.29	51.7	1.227
10	GTC3	19 Oct	05:13:01.0	180	GTC	11.85 ± 0.58	52.1	1.267
11	AF800545	26 Dec	22:09:36.0	1800	Copernico	13.37 ± 2.61	54.7	1.225
12	AF800546	26 Dec	22:33:36.6	1800	Copernico	10.09 ± 2.12	58.6	1.171
13	AF800547	26 Dec	23:03:28.2	1800	Copernico	15.16 ± 2.49	63.3	1.119
14	AF800548	26 Dec	23:36:27.2	1800	Copernico	14.17 ± 2.06	67.8	1.080
15	AF800549	27 Dec	00:10:14.7	1800	Copernico	14.90 ± 1.51	71.2	1.056
16	AF800550	27 Dec	00:50:16.5	1800	Copernico	13.54 ± 2.13	72.6	1.048
17	AF800551	27 Dec	01:23:27.7	1800	Copernico	11.23 ± 0.39	71-1	1.057	SO-SE
18	AF800552	27 Dec	01:56:24.7	1800	Copernico	8.87 ± 1.54	67.7	1.080	SE
19	AF800553	27 Dec	02:30:01.4	1800	Copernico	8.81 ± 1.37	63.1	1.121	SE
20	AF800554	27 Dec	03:02:53.4	1800	Copernico	17.04 ± 1.96	57.9	1.179
21	AF800555	27 Dec	03:35:58.2	1800	Copernico	14.39 ± 2.73	52.5	1.509
22	AF800626	27 Dec	22:11:41.3	1800	Copernico	14.41 ± 1.65	56.1	1.204
23	AF800627	27 Dec	22:44:10.0	1800	Copernico	11.31 ± 2.50	61.3	1.139

Mutual events are indicated as SE (secondary eclipse) and SO (secondary occultation) in the last column.

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