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List of start times of the site parameter measurements
*SQM, sky quality meter; LH-Cam, Lenghu all-sky camera; DIMM, differential image motion monitor; PWV, precipitable water vapour; NSB, night sky background brightness; AOT, available observing time; TP, turbulence profile. †Three balloon flights were carried out on 12 August 2020 (one flight) and 16 November 2020 (two flights), respectively. See Methods for detailed derivation of the parameters.
