I am reading the NSERC CGS-D portion in https://www.nserc-crsng.gc.ca/Students-Etudiants/PG-CS/index_eng.asp
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The Canada Graduate Scholarships—Doctoral (CGS D) program is a federal program of scholarships awarded through national competitions by the granting agencies: the Canadian Institutes of Health Research (CIHR), the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Social Sciences and Humanities Research Council of Canada (SSHRC).
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So it means that CGS-D is awarded by one of three agencies (CIHR NSERC SSHRC) depending on whether your filed of study is "head science", "Engineering" or "Humanities", right?