Eruptive mass loss less than a year before the explosion of superluminous supernovae - I. The cases of SN 2020xga and SN 2022xgc

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Table B.1.

SN 2020xga spectroscopic observations.

UT date	MJD	Phase^a	Telescope +	Exposure	Disperser	Wavelength range
	(days)	(days)	Instrument	(s)		(Å)
20201106	59159.6	-9	NTT + EFOSC2	1500	Gr#13	3650 – 9250
20201107	59160.6	-8.3	VLT + X-shooter	3600	–	3000 – 24800
20201116	59169.8	-1.9	NTT + EFOSC2	2700	Gr#11 + Gr#16	3345 – 9995
20201117	59170.7	-1.3	NTT + EFOSC2	2700	Gr#11	3345 – 7470
20201207	59190.6	+12.7	NTT + EFOSC2	5400	Gr#13	3650 – 9250
20201230	59213.6	+28.8	NTT + EFOSC2	5400	Gr#13	3650 – 9250
20210107	59221.2	+34.1	P200 + DBSP	3600	600/316	3500 – 10000
20210110	59224.6	+36.4	VLT + X-shooter	4800	–	3000 – 24800
20210114	59228.6	+39.3	VLT + X-shooter	4800	–	3000 – 24800

Notes.

^(a)

Rest-frame relative to the g-band maximum (MJD 59172.5).

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