(*TEST* flat inverted) --- filter B, bin 2, night 230419, compared to previous night 230418, sigma = 0.0057 --- (flat / previous inverted)
(*TEST* flat inverted) --- filter R, bin 2, night 230419, compared to previous night 230418, sigma = 0.0048 --- (flat / previous inverted)
(*TEST* flat inverted) --- filter V, bin 2, night 230419, compared to previous night 230418, sigma = 0.0052 --- (flat / previous inverted)