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Table 2

Statistical comparison between the different continuum determination methods described in Sect. 2.1.

Success rate (in %) for different discrepancies

Continuum determination method Mean Median Deviation <1% <5% 5–10% 10–25% >25%
(1) (2) (3) (4) (5) (6) (7) (8) (9)

(A) maximum 50.97 50.54 8.9 26.4 75.3 16.5 3.3 4.9
(B) mean 55.77 53.81 16.6 7.8 22.4 13.6 31.2 32.8
(C) mean (sel.) 51.05 50.57 9.0 25.3 63.9 20.0 11.1 5.0
(D) median 52.96 51.21 12.7 16.5 41.5 13.2 25.9 19.4
(E) median (sel.) 51.02 50.55 9.0 27.6 67.9 18.4 8.7 5.0
(F) 25th percent 44.32 48.14 12.7 11.0 41.5 16.9 18.1 23.5
(G) 75th percent 65.38 56.95 21.8 7.3 25.9 15.2 22.0 36.9
(H) Gaussian 51.31 50.62 10.2 26.8 57.2 17.8 13.1 11.9
(I) Gaussian (sel.) 51.04 50.62 8.8 25.6 65.7 19.9 9.2 5.2
(J) KDE max 50.69 50.70 9.5 21.6 70.5 16.4 7.3 5.8
(K) SCM 50.60 50.49 8.4 33.8 77.1 12.9 3.2 6.8
(L) c-SCM 50.19 50.22 8.2 48.8 87.9 4.4 0.9 6.8

Notes. The real continuum level of each of the 750 synthetic spectra is 50 K. Therefore, the closer the mean and median values are to this value, the more accurate the continuum determination method is. The success rate indicates how many cases (in %) are within a certain level of discrepancy: difference between determined continuum level and real value of 50 K.

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