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By combining with the DENIS data in the near-infrared J and K$_{\\rm S}$ bands, one derives the extinction at 7{\\rm $\\mu$m} through ${\\rm A_{K_{\\rm S}}-A_7= 0.35 (A_J-A_{K_{\\rm S}})}$ which yields A$_{7}$/A$_{\\it V}$ $\\sim$0.03 from the near-IR extinction values of van de Hulst--Glass (Glass 1999). 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