a) Fluctuations ς_α,...,δ (rms) of α,...,δ between the last image I = 25 and any other one I = 1, 24 in temporal order (72 channels average). Open circles represent raw data and full circles data corrected for LED jitter. Variable α senses all noise sources; β (γ) suppresses the line (column) correlated electronic noise and the LED jitter along x (y) axes; δ suppresses all correlated noises and LED jitter. b) Relative fluctuations 2 ×⟨ ς_β(,γ,δ)/α ⟩ are compared to the prediction. The continuous line representing the prediction ∝1/ uses the flux Φ(t) drawn in Fig. 15b. Error bars are given by the Ψ_k dispersion (k = 1, 72). The individual channel precision is 5 × 10^-6, the 72 channel average precision is 0.7 × 10^-6.