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Nod and Shuffle

The GMOS Nod & Shuffle mode applies techniques adopted for the infrared to optical MOS, long-slit, and IFU (Gemini-South only) spectroscopy whereby the sky is sampled with the same pixels used to observe the science target.

The advantages of observing with Nod & Shuffle include:


  • Improved sky subtraction
  • Potential increased density of slits

Disadvantages of observing with Nod & Shuffle include:


  • Increased observing overheads
  • Potential decreased field of view

Further details about Nod & Shuffle mode provided in this section are as follows.