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Sampling sites of P. vlangalii. DLH = Delingha (2,900 m ASL), DL = Dulan (3,338 m ASL), and MD = Maduo (4,250 m ASL). The elevation gradient is represented by graduated color, from yellow to blue (low to high). The map was created by ArcGIS 10.0 basing on the open data of Earth Resources Observatory and Science (EROS) Center (http://eros.usgs.gov/#)
