CUT PARTS OF SLIT LIGHT 
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Fig.5 Three slit lights with cut system 
Fig.6(b) Image of light up from only upside 
  
Fig.6(a) Image of two slit lights system Fig.6(c) Image of three slit lights system 
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996