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Mineralogical Magazine; April 2004; v. 68; no. 2; p. 323-333; DOI: 10.1180/0026461046820189
© Mineralogical Society of Great Britain and Ireland
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FIG. 5. White reference image obtained with a 10x MS-PLAN objective lens at 438±10 m. The original image appears homogeneous to the human eye as it displays grey-level values between 180 and 206 (left). After stretching of the histogram (right), attenuations due to dust, interference patterns and optical aberrations are clearly perceptible which demonstrates the importance of a background correction for proper imaging of mineral spectra.





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