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JDEM Database size estimate based on Slitless Spectroscopy requirements

Imaging

400K objects/sq.degree * 10,000 sq.degrees
4B objects
100 double precision numbers per object * 8 bytes per number
Data size: 4 TByte

Spectra

6000 double precision numbers per object * 8 bytes per number
50K bytes per object
100M objects
Data size: 5 TB