@prefix rdf: . @prefix xsd: . @prefix dcterms: . @prefix skos: . @prefix rdfs: . @prefix api: . @prefix foaf: . skos:narrower . skos:narrower . a rdfs:Resource , skos:Concept ; dcterms:contributor ; dcterms:modified "2021-08-24T15:21:16.154Z"^^xsd:dateTime ; skos:altLabel "Two color diagrams"@en , "Color-color diagrams"@en ; skos:broader , , ; skos:definition "A graph on which two color indices such as B-V and U-B are plotted, one along each axis, for a sample of stars or other objects, such as stars."@en ; skos:prefLabel "Two-colour diagrams"@en-gb , "Two-color diagrams"@en . skos:narrower . a api:ItemEndpoint , api:Page ; api:definition ; api:extendedMetadataVersion ; foaf:primaryTopic .