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- [[File:HRDiagram.png|upright=1.4|thumb|An observational Hertzsprung–Russell diagram with 22,000 stars plotted from the [[Hipparcos Catalogue]] and 1,00 The '''Hertzsprung–Russell diagram''' (abbreviated as '''H–R diagram''', '''HR diagram''' or '''HRD''' ...23 KB (3,294 words) - 02:42, 18 July 2024