Comparison of the spectrometric effective area (integrated over the PSF) of the high resolution spectrometers on the X-ray telescopes CHANDRA, XMM-NEWTON, and SODART. The curves are labeled with the grating/detector combination (CHANDRA and XMM) or the crystal type/detector combination (SODART). To avoid confusion, the low-energy CHANDRA curve is shown in the low-energy region only (< 2 keV); the high-energy CHANDRA curve is slightly smoothed. The dotted parts of the SODART curves indicate energy regions, where the Bragg spectrometer efficiency drops down due to a very large or very small Bragg angle.