RGS1 first order data (blue solid crosses) and best-fit power law + narrow Gaussian fit (solid red line), divided by the power-law component in the waveband containing the O iv line and the oxygen edge (green dashed lines) The RGS1 second order data (blue dotted crosses) are shown at wavelengths 2 times the original wavelengths, scaled arbitrarily for display purposes. The black curve indicates the RGS1 instrumental efficiency from de Vries et al. (2003), scaled to unity at λ = 22.6 Å.
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