XMM Users' Handbook

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Effective area for dispersive spectroscopy

Fig. 74 displays the effective area of both RGS units together (from Fig. 54), compared with different AXAF instrument combinations. In order to avoid overcrowding the figure, the combination of AXAF HRC+LETG is not shown.

**Figure 74:** *The effective area of both RGS units combined and RGS-1 (linear scale), compared with* *AXAF's ACIS-S instrument with various transmission gratings.*
$\begin{figure} \begin{center} \leavevmode \epsfig{width=0.6\hsize, angle=270, file=figs/xmm_vs_axaf_specarea.eps} \end{center} \end{figure}$

European Space Agency - XMM Science Operations Centre