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Flat/Arc Configuration and Exposure Times

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Flat field images and ThAr spectra do not have to be planned during phaseII, as they will be observed in the day time as baseline calibrations. These calibrations will be passed along with the data observed during the night in the corresponding spectral mode.

If you want to have ThAr spectra taken at night with your science, please add this to your science sequence.  Please see the GRACES OT library for examples of how to do this.    The basic setup adds 3 arc exposures but you may also choose to take a single arc exposure.   Exposure times are 50s for 2-fiber mode and 100s for 1-fiber mode.

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