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Spectra ups Cyg - HD202904  - mag.: 4.4 - H-alpha detail

Telescope: 0.28 f/10 (C11 Cassegrain)

Spectroscope: L200 with 1800 l/mm grating

Calibration with internal Ar/ne

Calibration RMS: 0.002 A

Resolving Power: 10042

Exposure: 2 x 600s