Detection limits versus sampling for the corrected signal using reconstructed Ca for the correlation-based method (stars, orange), and the LPA method (squares, blue). Each row corresponds to a different Ca noise level (from top to bottom: no noise, σ_high, σ_med, σ_low). Each column corresponds to a data set (from left to right: from Set 1 to Set 4). The errorbar symbols indicate the minimum value and maximum values for each detection limit, computed for ten realisations of the Ca noise.