(*TEST* flat inverted) --- filter V, bin 2, night 210130, compared to previous night 210114, sigma = 0.0119 --- (flat / previous inverted)
(flat inverted) --- filter B, bin 2, night 210113
(flat inverted) --- filter SG, bin 2, night 210115
(flat inverted) --- filter SI, bin 2, night 210129
(flat inverted) --- filter SR, bin 2, night 210115
(flat inverted) --- filter V, bin 2, night 210130