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Spectra HD164447 - V974 Her - H-alpha detail

Telescope: 0.28 f/10 (C11 Cassegrain)

Spectroscope: LHiRessIII with 2400 l/mm grating

Calibration with internal Ar/ne

Calibration RMS:  9E-9 A

Resolving Power: 12549

Exposure: 3 x 1200s