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LETG and Higher Orders

The LETG has significant contributions of higher orders (orders>1) in the extracted spectrum. These contributions are most noticeable at large dispersion distances (long wavelengths) and at wavelengths above 155 Åcan dominate over the first order spectra. This can be seen in figure 9 which plots the effective area of the HRMA + LETG + HRC-S vs dispersion distance.

Figure 9: LETG Effective Areas


David Davis