(*TEST* flat inverted) --- filter B, bin 2, night 211119, compared to previous night 211116, sigma = 0.0578 --- (flat / previous inverted)
(*TEST* flat inverted) --- filter R, bin 2, night 211119
(*TEST* flat inverted) --- filter V, bin 2, night 211119, compared to previous night 211116, sigma = 0.0588 --- (flat / previous inverted)