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1 Introduction
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2 Overview of the instrument
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3 Background to the CDS calibration
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4 The spectroscopic method
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5 Observations and data analysis
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6 First step: The effects of the solar variability
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7 Second step: Direct calibration of the overlapping spectral regions and its time stability
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8 Third step: The assessment of the useful calibration ratios
and observations
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9 Fourth step: Application of the spectroscopic method
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10 Conclusions
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Appendix A: Details on the lines used for the calibration
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Appendix B: The comparison between observed and theoretical spectra
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References
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