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The gratings available for use with the IDS are given in Tables 3.1 and 3.2, and their efficiency as a function of wavelength, in Figure 2.4.
The R or H prefix in the name of the grating indicates whether it is conventionally ruled (R) or ``holographic'' (H). The number indicates the frequency of groves/mm. And the last letter refers to the region of the spectrum where maximum efficiency occurs.
Graphs of grating settings are given in Dataset 5 of the IPCS Cook Book.