Table 7: $\lambda /\Delta \lambda _{\it FWHM}$ ratios for the possible astronomical features observed in the RGS-1 spectra of Mkn 421. The instrumental resolving power is $\lambda /\Delta \lambda _{\it FWHM} < 500$ .
Feature $\lambda$ $\lambda /\Delta \lambda _{\it FWHM}$

number (Å) ToO Archival Total

2 18.680 $\rm 780^{+190}_{-290}$ $\rm 1230^{+160}_{-240}$ $\rm 570^{+120}_{-150}$

3 18.953 $2370\pm300$ $1310\pm 180$ $\rm 680^{+100}_{-120}$

7 21.603 $\rm 280^{+90}_{-100}$ $\rm 320^{+70}_{-90}$ $270\pm50$

8 21.823 $3110\pm440$ $1820\pm300$ $3640\pm1200$

9 22.778 $2530\pm280$ $1470\pm470$ $\rm 3800^{+630}_{-1260}$

10 23.510 $370\pm70$ $\rm 370^{+110}_{-150}$ $\rm 330^{+50}_{-60}$

**Table 7:** $\lambda /\Delta \lambda _{\it FWHM}$ ratios for the possible astronomical features observed in the RGS-1 spectra of Mkn 421. The instrumental resolving power is $\lambda /\Delta \lambda _{\it FWHM} < 500$ .
Feature	$\lambda$	$\lambda /\Delta \lambda _{\it FWHM}$
number	(Å)	ToO	Archival	Total
2	18.680	$\rm 780^{+190}_{-290}$	$\rm 1230^{+160}_{-240}$	$\rm 570^{+120}_{-150}$
3	18.953	$2370\pm300$	$1310\pm 180$	$\rm 680^{+100}_{-120}$
7	21.603	$\rm 280^{+90}_{-100}$	$\rm 320^{+70}_{-90}$	$270\pm50$
8	21.823	$3110\pm440$	$1820\pm300$	$3640\pm1200$
9	22.778	$2530\pm280$	$1470\pm470$	$\rm 3800^{+630}_{-1260}$
10	23.510	$370\pm70$	$\rm 370^{+110}_{-150}$	$\rm 330^{+50}_{-60}$

Source LaTeX | All tables | In the text

	1 Introduction
	2 The XMM-Newton observations and data reduction
	3 Looking for lines in various segments of the spectra
	4 Discussion
	5 Conclusions
	References
	Online Material
	Appendix A: RGS spectral analysis and comparison with EPIC-PN