Table 6: Aliphatic column density ( $N[3.4] = N{\rm [CH}_{2}] + N{\rm [CH}_{3}$ ], see Table 7) in the region 2800-3000 cm^-1 and silicate column density (N[10]) around 1000 cm^-1) of the IDPs after the HF treatment, calculated after a baseline correction. See text for error estimates.
IDP area [3.4] area [10] N[3.4] N[10] SiO remaining

(aliph C atom/cm²) (Si atoms/cm²) $\%$

W7116B-N 0.20 0.9 $2.6 \times 10^{16}$ $1.1 \times 10^{16}$ 40

W7116B-Y 0.33 5.1 $4.2 \times 10^{16}$ $5.9 \times 10^{16}$ 98

W7116B-U 0.15 2.6 $2.3 \times 10^{16}$ $3.1 \times 10^{16}$ 26

L2036-E19 0.02 0.3 $^{*}2.0 \times 10^{15}$ $3.7 \times 10^{15}$ 6

L2021-K3 0.12 0.1 $1.4 \times 10^{16}$ $1.3 \times 10^{15}$ 3

L2021-K2 0.17 0.9 $1.9 \times 10^{16}$ $1.1 \times 10^{16}$ 30

L2011-F2 0.09 0.1 $1.3 \times 10^{16}$ $1.6 \times 10^{15}$ 2

^* This value was obtained by integration of the whole 3.4 ${\mu }$ m feature,
since the CH₂ and CH₃ peaks were not well resolved.

**Table 6:** Aliphatic column density ( $N[3.4] = N{\rm [CH}_{2}] + N{\rm [CH}_{3}$ ], see Table 7) in the region 2800-3000 cm^-1 and silicate column density (N[10]) around 1000 cm^-1) of the IDPs after the HF treatment, calculated after a baseline correction. See text for error estimates.
IDP	area [3.4]	area [10]	N[3.4]	N[10]	SiO remaining
			(aliph C atom/cm²)	(Si atoms/cm²)	$\%$
W7116B-N	0.20	0.9	$2.6 \times 10^{16}$	$1.1 \times 10^{16}$	40
W7116B-Y	0.33	5.1	$4.2 \times 10^{16}$	$5.9 \times 10^{16}$	98
W7116B-U	0.15	2.6	$2.3 \times 10^{16}$	$3.1 \times 10^{16}$	26
L2036-E19	0.02	0.3	$^{*}2.0 \times 10^{15}$	$3.7 \times 10^{15}$	6
L2021-K3	0.12	0.1	$1.4 \times 10^{16}$	$1.3 \times 10^{15}$	3
L2021-K2	0.17	0.9	$1.9 \times 10^{16}$	$1.1 \times 10^{16}$	30
L2011-F2	0.09	0.1	$1.3 \times 10^{16}$	$1.6 \times 10^{15}$	2

Source LaTeX | All tables | In the text

	1 Introduction
	2 Materials and methods
	3 Results
	4 Discussion
	5 Conclusions and perspectives
	References