Table 1. Locations and sky conditions during the campaign.

Location	Altitude	Position	Date	Sky Conditions
Antofagasta	114 m	23°27'16.07′′S 70°26'21.40′′W	08.02.2015	Cloudless
			09.02.2015	Stratocumulus clouds in the Morning
			10.02.2015	Cloudless
Caldera	208 m	27°15'53.96′′S 70°46'32.65′′W	12.02.2015	Cloudless
			13.02.2015	Stratocumulus clouds in the Morning
			14.02.2015	Stratus clouds
El Salvador	1600 m	26°18'50.88′′S69°45'10.71 W	16.02.2015	Cloudless
			17.02.2015	Cloudless
			18.02.2015	Cloudless
D. de Almagro	780 m	26°23'40.74′′S70° 3'2.40′′W	20.02.2015	Cloudless
			21.02.2015	Cloudless
			22.02.2015	Cloudless
Calama	2293 m	22°29'50.84′′S68°54'51.57′′W	24.02.2015	Cloudless
			25.02.2015	Cloudless
			26.02.2015	Cloudless
			27.02.2015	Altostratus Clouds
Chajnantor	5100 m	22° 57′ 30″ S 67° 47′ 10″ W	02.03.2015	Cloudless
			03.03.2015	Cirrus clouds in the Afternoon
			04.03.2015	Cirrus clouds in the Morning
M. Elena	1184 m	22°16'28.64′′S 69°33'59.08′′W	07.03.2015	Cloudless
			08.03.2015	Cloudless
			09.03.2015	Cloudless