5.12 Spectral Element [Sp_Element]

The desired Spectral Element should be chosen. Spectral Elements include filters (F), gratings and grisms (G), echelles (E), prisms (PR), polarizers (POL), linear ramps (FR), quadrant filters (FQ) and mirrors (MIRROR). The names of the filters, gratings, grisms, and echelles include the wavelength of the approximate midpoint of the bandpass, in nanometers.

Examples of the Spectral Element designations are the following:

F122M	A medium-band (M) WFPC2 filter (F) with midpoint of coverage near 1220 Å
G206	A NICMOS grism (G) with midpoint of coverage near 2.06 microns
POLQN33	WFPC2 polarizer at 33 degree angle

Polarizer or Crossed Filter

More than one element may be specified, if necessary, using these fields Choose the desired element from the list provided in Part II of these Instructions. They are also are described in the Instrument Handbooks.

Text Proposal File (Sp_Element)

If you are using the Text Proposal File, a second spectral element can be specified after the first one separated by a comma.