Wrap up
Nod-shuffle spectroscopy
- Powerful new method for faint object spectroscopy
High-density of spectra in small FOVs
- Microslit masks, easily made
Can be adapted to just about any system
- Multislit, fibre
- Need shuffling function on CCD controllers
Interesting new modes
- Dispersive emission line searches
Removal of systematics in sky subtraction:
- Temporal, slits, flatfields, fringeing, flexure,…
- Powerful EXACT DIFFERENTIAL method
- Break the traditional 10 hour exposure barrier?