Table 5: Best-fit parameters of the power-law plus three Gaussians model reproducing the [22-24] Å Mkn 421 spectra taken by the RGS-1. The error bars refer to the 90% confidence intervals.
RGS-1 [22.5-24.5] Å

Feature $\lambda$ FWHM k

number (Å) (mÅ) (cts cm^-2 s^-1 Å^-1)

ToO observation

9 $22.770\pm0.001$ $9\pm1$ $-0.011\pm0.003$

10 $23.510\pm0.007$ $\rm 64^{+13}_{-12}$ $-0.004\pm0.001$

Archival data

9 $\rm 22.789^{+0.003}_{-0.002}$ $15.5\pm5$ $-0.225\pm0.0665$

10 $23.510\pm0.013$ $\rm 64^{+26}_{-20}$ $-0.082\pm0.029$

Total

9 $22.778\pm0.001$ $\rm 6^{+2}_{-1}$ $-0.304\pm0.086$

10 $23.510\pm0.007$ $\rm 71^{+13}_{-11}$ $-0.133\pm0.020$

**Table 5:** Best-fit parameters of the power-law plus three Gaussians model reproducing the [22-24] Å Mkn 421 spectra taken by the RGS-1. The error bars refer to the 90% confidence intervals.
RGS-1 [22.5-24.5] Å
Feature	$\lambda$	FWHM	k
number	(Å)	(mÅ)	(cts cm^-2 s^-1 Å^-1)
ToO observation
9	$22.770\pm0.001$	$9\pm1$	$-0.011\pm0.003$
10	$23.510\pm0.007$	$\rm 64^{+13}_{-12}$	$-0.004\pm0.001$
Archival data
9	$\rm 22.789^{+0.003}_{-0.002}$	$15.5\pm5$	$-0.225\pm0.0665$
10	$23.510\pm0.013$	$\rm 64^{+26}_{-20}$	$-0.082\pm0.029$
Total
9	$22.778\pm0.001$	$\rm 6^{+2}_{-1}$	$-0.304\pm0.086$
10	$23.510\pm0.007$	$\rm 71^{+13}_{-11}$	$-0.133\pm0.020$

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