5.13 Central Wavelength or Range if Grating or Prism Used [Wavelength]

If a linear ramp filter, quadrant filter, grating, or prism is to be used, the central wavelength should be entered. NICMOS exposures do not require a central wavelength or range.

Wavelengths should be expressed in Å in the observed frame (but the units should be omitted). Use vacuum wavelengths below 2000 Å, and air wavelengths above 2000 Å.