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Table A.1

Coefficients of the fourth-order polynomial fits (Eq. (A.1)) to the variations of b/Rd as a function of hz/Rd for the modelling of each disk subcomponent, as shown in Fig. A.1.

Component k0 k1 k2 k3 k4

Thin disk 0.0132 0.9995 0.4828 0.0752 0.1284
Thick disk 0.0078 1.0648 0.6067 0.3934 0.0660
H I disk 0.0064 1.1169 0.0776 0.1604 0.0631
H2 disk 0.0003 1.2694 0.2919 0.1023 0.0935

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