Wavelengths measured using the SNIFS exposures for the blue channel (panel a) and the red channel (panel d) versus the ones requested to the monochromator, plotted together with the linear fit (black line). Panels b and e: residuals from the linear fits (blue squares) and running average of the residuals (red line), computed with an averaging window of 20 data points. The blue shaded region represents the standard deviation interval of the data of ±1.51 Å (in panel b) and ±1.01 Å (in panel e). Panels c and f: results of subtracting the running averages from the residuals of the linear fits (blue squares). The blue shaded region represents the standard deviation interval of the data of ±1.39 Å (in panel c) and ±0.79 Å (in panel f).
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