Table 2: The composition in terms of mass fractions in percent together with the significance of the detection of the dust components for the best fit models using various particle shapes. A "-'' denotes that the dust component was detected with a significance less than 1 $\sigma$ and was thus removed from the fitting procedure. Enstatite was not found to be significant using any of the four grain shapes and is therefore omitted from the table. The (A, C) behind the name in the first column denotes if the material is amorphous or crystalline. The names "olivine'' and "pyroxene'' are used for the amorphous silicates to refer to the average stoichiometry. The x₁, x₂, x₃, x₄ refer to the average silicate composition, Mg_x₁Fe_x₂Na_x₃Al_x₃SiO_x₄ implied by the abundances of all silicates.
Spherical grains Porous GRF grains Coated GRF grains DHS ( $f_{\rm max}=0.7$ )

$\chi^2$ 65.3 12.6 11.5 10.1

Silicates

Olivine (A; x=0.5) MgFeSiO₄ 57.9 (6.2 $\sigma$ ) 16.9 (1.9 $\sigma$ ) 9.7 (1.1 $\sigma$ ) 13.8 (2.0 $\sigma$ )

Pyroxene (A; x=0.5) MgFeSi₂O₆ 12.9 (7.6 $\sigma$ ) - - -

Olivine (A; x=1) Mg₂SiO₄ 28.9 (1.0 $\sigma$ ) 47.2 (3.5 $\sigma$ ) 48.2 (3.5 $\sigma$ ) 38.3 (3.8 $\sigma$ )

Pyroxene (A; x=1) MgSiO₃ - 24.0 (6.1 $\sigma$ ) 31.4 (6.8 $\sigma$ ) 42.9 (6.7 $\sigma$ )

Na/Al pyroxene (A) NaAlSi₂O₆ - 6.8 (3.2 $\sigma$ ) 5.3 (2.7 $\sigma$ ) 1.8 (1.1 $\sigma$ )

Silica (A) SiO₂ 0.3 (1.1 $\sigma$ ) - - -

Forsterite (C) Mg₂SiO₄ - 1.5 (4.7 $\sigma$ ) 1.3 (3.6 $\sigma$ ) 0.6 (3.2 $\sigma$ )

Other

Silicon carbide (C) SiC - 3.6 (3.7 $\sigma$ ) 4.2 (4.3 $\sigma$ ) 2.6 (5.3 $\sigma$ )

The average silicate composition implied by the above abundances

x₁ Mg/Si 1.22 1.37 1.39 1.32

x₂ Fe/Si 0.60 0.13 0.07 0.10

x₃ (Na, Al)/Si 0.00 0.05 0.03 0.01

x₄ O/Si 3.82 3.59 3.53 3.45

**Table 2:** The composition in terms of mass fractions in percent together with the significance of the detection of the dust components for the best fit models using various particle shapes. A "-'' denotes that the dust component was detected with a significance less than 1 $\sigma$ and was thus removed from the fitting procedure. Enstatite was not found to be significant using any of the four grain shapes and is therefore omitted from the table. The (A, C) behind the name in the first column denotes if the material is amorphous or crystalline. The names "olivine'' and "pyroxene'' are used for the amorphous silicates to refer to the average stoichiometry. The x₁, x₂, x₃, x₄ refer to the average silicate composition, Mg_x₁Fe_x₂Na_x₃Al_x₃SiO_x₄ implied by the abundances of all silicates.
		Spherical grains	Porous GRF grains	Coated GRF grains	DHS ( $f_{\rm max}=0.7$ )
$\chi^2$	65.3	12.6	11.5	10.1
Silicates
Olivine (A; x=0.5)	MgFeSiO₄	57.9	(6.2 $\sigma$ )	16.9	(1.9 $\sigma$ )	9.7	(1.1 $\sigma$ )	13.8	(2.0 $\sigma$ )
Pyroxene (A; x=0.5)	MgFeSi₂O₆	12.9	(7.6 $\sigma$ )	-		-		-
Olivine (A; x=1)	Mg₂SiO₄	28.9	(1.0 $\sigma$ )	47.2	(3.5 $\sigma$ )	48.2	(3.5 $\sigma$ )	38.3	(3.8 $\sigma$ )
Pyroxene (A; x=1)	MgSiO₃	-		24.0	(6.1 $\sigma$ )	31.4	(6.8 $\sigma$ )	42.9	(6.7 $\sigma$ )
Na/Al pyroxene (A)	NaAlSi₂O₆	-		6.8	(3.2 $\sigma$ )	5.3	(2.7 $\sigma$ )	1.8	(1.1 $\sigma$ )
Silica (A)	SiO₂	0.3	(1.1 $\sigma$ )	-		-		-
Forsterite (C)	Mg₂SiO₄	-		1.5	(4.7 $\sigma$ )	1.3	(3.6 $\sigma$ )	0.6	(3.2 $\sigma$ )
Other
Silicon carbide (C)	SiC	-		3.6	(3.7 $\sigma$ )	4.2	(4.3 $\sigma$ )	2.6	(5.3 $\sigma$ )
The average silicate composition implied by the above abundances
x₁	Mg/Si	1.22		1.37		1.39		1.32
x₂	Fe/Si	0.60		0.13		0.07		0.10
x₃	(Na, Al)/Si	0.00		0.05		0.03		0.01
x₄	O/Si	3.82		3.59		3.53		3.45

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