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Table 5

The ratio R = Flux(18 μ)/Flux(10 μ) for the models and observed silicate features.

Object/Star R(Model Si+f*Gr) R(Model Si+f*Por) R(Observed)

Average Observed IRAS-LRS flux 0.201 0.189 0.255
IRAS 16340-4634 0.383 0.379 0.394
IRAS 17315-3414 0.276 0.283 0.236

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