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All spectra were hand-inspected, with samples that did not meet certain criteria (e.g. a near-infrared rise, or a green local maximum) were discarded. \n\nMultispectral data were calibrated against ground gray references and orthorectified using commercially available algorithms. \n\nFlow cytometry ploidy level data were validated against Hordeum vulgare standards; DNA microsatellite ploidy level data were validated using published algorithms described in more detail in the supplemental information.\n","metadataDate":"2026-06-29T16:40:44","notGEMINI":true,"onlineResources":[{"url":"https://data-package.ceh.ac.uk/data/d663aeb9-1e3e-40f7-ab9e-494e7646faeb","name":"Download the data","description":"Download a copy of this data","function":"download","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/d663aeb9-1e3e-40f7-ab9e-494e7646faeb.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this 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