1) Astronomical catalogue
Found on
https://www.crosswordclues.com/clue/spectral-atlas
In astronomy, a spectral atlas is a collection of spectra of one or more objects, intended as a reference work for comparison with spectra of other objects. Several different types of collections are titled spectral atlases. In any spectral atlas, generally all the spectra have been taken with the same equipment, or with very similar instruments a...
Found on
http://en.wikipedia.org/wiki/Spectral_atlas
No exact match found.
