(flat inverted) --- filter B, bin 1, night 210520
(flat inverted) --- filter C, bin 1, night 201004
(flat inverted) --- filter CV, bin 1, night 210220
(flat inverted) --- filter I, bin 1, night 210520
(flat inverted) --- filter R, bin 1, night 210520
(flat inverted) --- filter V, bin 1, night 210520