Extraction residuals of the argon lines in the MOS data taken with filter F140X and grating G140H, given in detector pixels. In the main panel, each measured line position from each spectrum is plotted with the error from the fit. The mean residual is −0.019 px with a standard distribution of 0.083 px. The points outside the 4σ-limit of the data are excluded as measurement errors. The right panel shows the distribution of the combined residuals of all lines.
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