Table 4: ${\tau _{912}}$ obtained from the column densities listed in Table 2 (with f =0) and in Table 3.
Filament Model A Model B

FP1 2.6 $\pm$ 0.6 6.4 $\pm$ 1.5

F2
3.5 $\pm$ 1.5 8.4 $\pm$ 3.7

F3
3. $\pm$ 1. 7. $\pm$ 2.4

**Table 4:** ${\tau _{912}}$ obtained from the column densities listed in Table 2 (with f =0) and in Table 3.
Filament	Model A	Model B
FP1	2.6 $\pm$ 0.6	6.4 $\pm$ 1.5
F2	3.5 $\pm$ 1.5	8.4 $\pm$ 3.7
F3	3. $\pm$ 1.	7. $\pm$ 2.4

Source LaTeX | All tables | In the text

	1 Introduction
	2 Data analysis
	3 Determination of ${\tau _{912}}$
	4 Discussion and conclusions
	References