Table 3: The results of the analysis using various SiC measurements available in the literature. We conclude that the SiC in the ISM has a lattice structure closest resembled by that of Laor & Draine (1993).
Spherical grains Porous GRF grains Coated GRF grains DHS ( $f_{\rm max}=0.7$ )

Crystalline SiC (Laor & Draine 1993) - 3.6% (3.7 $\sigma$ ) 4.2% (4.3 $\sigma$ ) 2.6% (5.3 $\sigma$ )

Crystalline $\beta$ -SiC (Mutschke et al. 1999) - 1.0% (2.6 $\sigma$ ) 1.2% (2.4 $\sigma$ ) 0.3% (4.0 $\sigma$ )

Amorphous SiC (Mutschke et al. 1999) - 5.8% (3.1 $\sigma$ ) 5.0% (2.9 $\sigma$ ) 4.1% (2.8 $\sigma$ )

**Table 3:** The results of the analysis using various SiC measurements available in the literature. We conclude that the SiC in the ISM has a lattice structure closest resembled by that of Laor & Draine (1993).
	Spherical grains	Porous GRF grains	Coated GRF grains	DHS ( $f_{\rm max}=0.7$ )
Crystalline SiC (Laor & Draine 1993)	-	3.6%	(3.7 $\sigma$ )	4.2%	(4.3 $\sigma$ )	2.6%	(5.3 $\sigma$ )
Crystalline $\beta$ -SiC (Mutschke et al. 1999)	-	1.0%	(2.6 $\sigma$ )	1.2%	(2.4 $\sigma$ )	0.3%	(4.0 $\sigma$ )
Amorphous SiC (Mutschke et al. 1999)	-	5.8%	(3.1 $\sigma$ )	5.0%	(2.9 $\sigma$ )	4.1%	(2.8 $\sigma$ )

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