Table 4: Aliphatic column density (noted N[3.4], in the region 3000-2800 cm^-1) and silicate column density (N[10], around 1000 cm^-1) of the IDPs before the HF treatment, calculated after baseline correction. See text for error estimates.
IDP area [3.4] area [10] N[3.4] N[10] N[3.4]/N[10]

(aliph C atom/cm²) (Si atoms/cm²) (aliph. C atoms/Si atoms)

W7116B-N 0.11 2.3 $2.1 \times 10^{16}$ $2.7 \times 10^{16}$ 0.78

W7116B-Y 0.43 5.2 $8.2 \times 10^{16}$ $6.0 \times 10^{16}$ 1.4

W7116B-U 0.07 10.0 $1.3 \times 10^{16}$ $1.2 \times 10^{17}$ 0.11

L2036-E19 0.11 5.0 $2.1 \times 10^{16}$ $5.9 \times 10^{16}$ 0.36

L2021-K3 0.12 3.6 $2.3 \times 10^{16}$ $4.2 \times 10^{16}$ 0.55

L2021-K2 0.05 3.0 $9.6 \times 10^{15}$ $3.6 \times 10^{16}$ 0.27

L2011-F2 0.14 6.0 $2.7 \times 10^{16}$ $7.0 \times 10^{16}$ 0.39

**Table 4:** Aliphatic column density (noted N[3.4], in the region 3000-2800 cm^-1) and silicate column density (N[10], around 1000 cm^-1) of the IDPs before the HF treatment, calculated after baseline correction. See text for error estimates.
IDP	area [3.4]	area [10]	N[3.4]	N[10]	N[3.4]/N[10]
			(aliph C atom/cm²)	(Si atoms/cm²)	(aliph. C atoms/Si atoms)
W7116B-N	0.11	2.3	$2.1 \times 10^{16}$	$2.7 \times 10^{16}$	0.78
W7116B-Y	0.43	5.2	$8.2 \times 10^{16}$	$6.0 \times 10^{16}$	1.4
W7116B-U	0.07	10.0	$1.3 \times 10^{16}$	$1.2 \times 10^{17}$	0.11
L2036-E19	0.11	5.0	$2.1 \times 10^{16}$	$5.9 \times 10^{16}$	0.36
L2021-K3	0.12	3.6	$2.3 \times 10^{16}$	$4.2 \times 10^{16}$	0.55
L2021-K2	0.05	3.0	$9.6 \times 10^{15}$	$3.6 \times 10^{16}$	0.27
L2011-F2	0.14	6.0	$2.7 \times 10^{16}$	$7.0 \times 10^{16}$	0.39

Source LaTeX | All tables | In the text

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