Microslit sky issues

• Sky time is NOT a loss

  • One can always nod-shuffle in slit
  • e.g. instead of doing 300 objects ON-OFF
  • Do 150 objects ON1-ON2 with 2x bigger slits
  • Same objects observed / unit time (but lower sky densities!)

• Do get ?2 more noise in sky-subtraction

  • Qualitative gains outway
    Trust features near sky
    
  • Simple nod in slit already quite common method for faint sources
    But this is EXACT
    

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