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• MRS_DF_Vis_79_220_7000_1.5Rs_1_0_0_0_2x2_none
• MRS_DF_Vis_79_220_7000_1.5Bs_1_0_0_0_2x2_none
• MRS_DF_Vis_79_220_7000_2.0R_1_0_0_0_2x2_none
• MRS_DF_Vis_79_220_7000_2.0B_1_0_0_0_2x2_none

• DF: The direct feed mode
• LS: The fiber synthetic long slit mode (has not been commissioned)
• MOS: The multi-object spectroscopy mode (has not been commissioned)

NOTE: DF is the only mode available for queue observations

• Vis: The visible beam only

• 79: The 79 line/mm echelle
• 110: The 110 line/mm echelle (not available for normal operation)

NOTE: 79 is the only mode available for queue observations

• 220: The 220 line/mm cross-disperser grating, blazed at 5900Å
• 600: The 600 line/mm cross-disperser grating, blazed at 6500Å (not available for normal operation)
• 900: The 900 line/mm cross-disperser grating, blazed at 5150Å (not available for normal operation)
• 1200: The 1200 line/mm cross-disperser grating, blazed at 5600Å (not available for normal operation)

NOTE: 220 is the only mode available for regular queue observations

Center wavelength in Angstroms for cross-disperser on CCD

NOTE: This will be 7000 for queue observations

For the DF mode there are four choices.
The two 1.5 arcsec modes yeild R~7000 and the two 2.0 arcsec modes yield R~5000

• 1.5Rs: An object-sky pair of 300 micron core (1.5 arcsec on sky) FIP fibers separated by about 10 arcsec
• 1.5Bs: An object-sky pair of 300 micron core (1.5 arcsec on sky) FVP fibers separated by about 10 arcsec
• 2.0R: A single (i.e. object only) 200 micron core (2 arcsec on sky) FIP fiber
• 2.0B: A single (i.e. object only) 200 micron core (2 arcsec on sky) FVP fiber

Because the HET has a moving pupil sky chops are not ideal for removing the sky since the pupil size and throughput per mirror is changing through the track. Thus this option is best left as "1". If a PI wishes to try this option the PI will need to contact the RAs about experimenting with this option.
This is an integer number that specifies the number of object-sky switches to be done. Each exposure will be the total exposure time in the Phase II exposure line divided by the #
• 1: One exposure of specified length with object in default fiber
• 2: If using 1.5R or 1.5B, do second exposure of specified length with object moved to sky fiber in first exposure.
  If using 2R or 2B, object moved off fiber for second sky only exposure
• 3: etc.

• 0: For all DF expsoures there is a hardwired filter. It is a Schott type OG455 for the "R" fibers and a WG305 for the "B" fibers. One should be aware that there will be XD second order overlap beyong 9000 Å for the "R" fibers. There is the potential for XD second order overlap beyond ~7500 Å for the "B" fibers depending on the blue spectral energy distribution of the target.

There will be up to six filter options to be defined when in the LS or MOS mode

• 1: TBD
• 2: TBD
• 3: TBD
• 4: TBD
• 5: TBD

Specifies the slit width selected in microns

• 0: Only option in DF mode
• 100 (This option has not been commissioned):
• 200 (This option has not been commissioned):
• 300 (This option has not been commissioned):
• 600 (This option has not been commissioned):

Specifies the slit height at the spectrograph input in mm in one of three positions: upper (U), center (C), lower (L)

• 0: Only option in DF mode
• 5.0U (This option has not been commissioned):
• 15.0C (This option has not been commissioned):
• 3.0C (This option has not been commissioned):
• 5.5L (This option has not been commissioned):

This specifies the CCD binning requested

• 2x2: Default in DF mode until further notice
• Options to be defined in LS or MOS mode

• none: The default at present
• Will be necessary in the future to detail the position of fiber probes for MOS spectrscopy of guide probes for DF and LS modes

• MRS_DF_Vis_79_220_7000_1.5Rs_1_0_0_0_2x2_none
• MRS_DF_Vis_79_220_7000_1.5Bs_1_0_0_0_2x2_none
• MRS_DF_Vis_79_220_7000_2.0R_1_0_0_0_2x2_none
• MRS_DF_Vis_79_220_7000_2.0B_1_0_0_0_2x2_none