Effective area calibration of the reflection grating spectrometers of XMM-Newton - I. X-ray spectroscopy of the Crab nebula

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Table 3:

Wavelengths of absorption lines, all in Å.
Constituent	Oxygen	Iron	Iron	Ref.
	main line	main line	2nd line
Ferrous, Fe²⁺		17.498	17.196	a
Olivine	23.26			b
Ferric, Fe³⁺		17.456	17.130	a
Hematite	23.43			b
Atomic O I	23.508			c
Atomic Fe I		17.453	17.142	d
Crab	$23.466\pm 0.009$	$17.396\pm 0.009$	$17.120\pm 0.016$	e

^a van Aken & Liebscher (2002), corrected by -0.019 Å following Juett et al. (2006); ^b van Aken et al. (1998); ^c Juett et al. (2004), from Chandra spectra; ^d Behar et al. (2001), HULLAC calculations; ^e present work.

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