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The horizontal branch is so named because in low-metallicity star collections like globular clusters , HB stars lie along a roughly horizontal line in a Hertzsprung–Russell diagram .
 location: Hertzsprung–Russell
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Hertzsprung–Russell