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Table 13

C/O values and infrared dust features.

SiC/30 μm + PAHs PAHs + crystalline silicates No information

C/O > 1 NGC 6369, Pe 1-1 Cn 1-5, M 1-32, NGC 2867 M 1-30, NGC 5189
C/O < 1 Hb 4, He 2-86, M 1-25, PC 14
M 1-61, M 3-15, PB 8

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