Blue crosses show the data around the O ii 1s–2p wavelengths for RGS1 (upper panel), HRC (middle panel), and ACIS (lower panel). In case of HRC and ACIS we show the data without dividing with the continuum while this is not possible with RGS data owing to the special data processing. The black lines indicate the continuum, which in case of HRC and ACIS is convolved with the responses. The red areas (for RGS1 and HRC) indicate the Gaussian model contribution above the continuum. In the case of ACIS it is negligible. The green curves indicate the model from Nicastro et al. (2016).
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