1. Low-Energy Grating (LETG) close-up
The gratings exploit Chandra's sharp mirror focus and matching detector resolution to produce high resolution X-ray spectroscopy.

2. Low-Energy Grating (LETG) under construction
(from Peter Predehl)

3. High-Energy Grating (HETG) under construction (1)

4. HETG under construction (2)
(from Patrick Hindle, MIT)

5. High- and Low-Energy Gratings
being integrated into optical bench.

6. High- and Low-Energy Gratings
being integrated into optical bench.

7. High- and Low-Energy Gratings
being integrated into optical bench.

8. High- and Low-Energy Gratings
being integrated into optical bench.