"unmixings" meaning in English

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          "ref": "2015, Pierre-Antoine Thouvenin, Nicolas Dobigeon, Jean-Yves Tourneret, “Online unmixing of multitemporal hyperspectral images accounting for spectral variability”, in arXiv:",
          "text": "A comparison with independent unmixings of each image by state-of-the-art methods finally illustrates the interest of the proposed strategy..",
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