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(a) OD change at 690 nm from a single channel with no synthetic HRF with baseline shifts (green), high-frequency spikes (pink), zoomed out data (b and c) before correction (black) and after correction by spline (red), tPCA (green), tPCA-SG (brown), wavelet (cyan), CBSI (dark blue), SG (violet), spline-SG (magenta), Rloess (dark gold), and spline-Rloess (silver).
