Table 2: Estimated detached-shell radii ( $R_{\rm shell}$ ) of warm carbon stars exhibiting a cool MgS feature in their SWS spectra, based on the relation in Eq. (2) between the "30'' $\mu$ m feature centroid position and the size of the shell.
Source ${{m}_{\rm bol}}^{1}$ ${\lambda_{\rm C,30}}^{2}$ [ $\mu$ m] $R_{\rm shell}$ [ $^{\prime \prime }$ ]

W Ori 2.87 31.3 8

S Cep 3.15 $^\dagger$ 31.2 6

T Dra 4.94 30.2 1.6

V Cyg 3.24 $^\dagger$ 30.5 4

RU Vir 4.24 $^\dagger$ 30.4 2

¹Bolometric magnitude from Bergeat et al. (2002).
²Centroid positions taken from Hony et al. (2002).
$^\dagger$ Average of the listed values.

**Table 2:** Estimated detached-shell radii ( $R_{\rm shell}$ ) of warm carbon stars exhibiting a cool MgS feature in their SWS spectra, based on the relation in Eq. (2) between the "30'' $\mu$ m feature centroid position and the size of the shell.
Source	${{m}_{\rm bol}}^{1}$	${\lambda_{\rm C,30}}^{2}$ [ $\mu$ m]	$R_{\rm shell}$ [ $^{\prime \prime }$ ]
W Ori	2.87	31.3	8
S Cep	3.15 $^\dagger$	31.2	6
T Dra	4.94	30.2	1.6
V Cyg	3.24 $^\dagger$	30.5	4
RU Vir	4.24 $^\dagger$	30.4	2

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