Observations of the solar irradiance have been made with the CDS Normal Incidence Spectrometer in the ranges 30.8 nm to 38.1 nm and 51.3 to 63.3 nm, on a semi-regular basis since March 1997. Also observed are the He I I and Si X I lines at 30.4 nm in second order. We have used these observations to estimate the signal that SEM would see on those dates. In order to fill in the wavelengths below 30.0 nm, a DEM curve is generated from the CDS observations. Comparisons are also made with the EIT measurements for the same dates. Both pre-loss-of-attitude and post-recovery data are considered.
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