Fig. 1. Schematic diagram of signal area fitting

Fig. 2. Baseline-comparison of GradSuck fitting and quadratic polynomial fitting when SNR=50

Fig. 3. Baseline-comparison of various algorithms fitting without noise

Fig. 4. Comparison of baseline fitting of step when SNR=30

Fig. 5. Baseline fitting results of 100 experiments when SNR=30

Fig. 6. Fitting results of different algorithms with different noise ratios and different baselines

Fig. 7. Comparison of baseline fitting of background spectrum experimental data

Fig. 8. Comparison of baseline fitting of real chromatographic data

Fig. 9. Comparison of baseline fitting of Admite spectrum