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Table 6

Observed circumstellar excess ratios, based on the naked colors of a 2600 K star.

Excess ratios Mean_1 (Curve3) Sigma_1 (Curve3) Mean_2 (Gordon) Sigma_2 (Gordon)
E(Ks−A)
E(Ks−D)
0.68 0.43 0.65 0.32
E(KsC)
E(Ks−D)
1.04 0.17 0.97 0.05
E(KsE)
E(Ks−D)
1.26 0.46 1.22 0.24
E(Ks−W1)
E(Ks−W3)
0.34 0.78 0.27 0.39
E(Ks−W2)
E(Ks−W3)
0.72 0.53 0.44 0.51
E(Ks−W4)
E(Ks−W3)
3.19 36.22 1.54 1.77
E(Ks−[3.6])
E(Ks−[5.8])
0.05 2.97 0.45 4.69
E(Ks−[4.5])
E(Ks−[5.8])
0.30 2.91 0.43 3.93
E(Ks−8.0)
E(Ks−[5.8])
1.30 0.80 1.18 1.46

Notes. The mean_1 and sigma_1 values are obtained after having dereddened the observed colors with the AKs$\[A_{K_{\mathrm{s}}}\]$ values and the revised curve 3 of Messineo et al. (2005). The mean_2 and sigma_2 values are obtained after having dereddened the observed colours with the AKs$\[A_{K_{\mathrm{s}}}\]$ values of Messineo et al. (2005) (rescaled to a power law of index −2.1) and the mid-interstellar extinction curve by Gordon et al. (2021). The best ratios (less affected by molecular absorption) are marked in bold.

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