Comparison of measured and reference flux densities of the primary calibrators Uranus (red) and Neptune (blue). Their ratios are shown for the three arrays A1 (260 GHz-H), A2 (150 GHz), and A3 (260 GHz-V). The mean ratio μ and relative scatter are provided for each array. The reference flux densities are from Moreno (2010), Bendo et al. (2013). The scan numbers are time-ordered: 1 to 10 refer the period 23–28 February, 2017 (fair weather) and 11 to 18 to the period 19–25 April, 2017 (mediocre weather).