Fig. 8. Image of an LETG spectrum of a very bright X-ray source, the nova XTE J1118+480. Only the shortest wavelengths are shown.

• Bright spot in center: the source (i.e., 0th order of the spectrum).
• Bright diagonal line extending corner to corner: the main dispersed spectrum (1st and higher orders).
• Bright line perpendicular to the main spectrum: cross-dispersion spectrum of 0th order, caused by the LETG fine-support structure.
• Faint six-pointed star pattern in the center: diffraction of 0th order by the triangle-pattern coarse-support structure.
• Faint fan of whiskers on either side: cross-dispersion orders caused by the fine-support structure. The main dispersed spectrum is 0th order of the cross-dispersion spectrum.