Fig. 1
Ratio of statistical uncertainties to the signal per bin in the co-added PKS 2155-304 observations using RGS1 1st order (red), RGS2 1st order (blue), LETG/HRC-S (black), and LETG/ACIS-S (green). The RGS bin size is 20 mÅ while LETG bin size is 25 mÅ. The curves have been smoothed strongly for clarity. The dashed lines indicate the waveband selected for the analysis in this paper.
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