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A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.
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Tunisia is situated on the Mediterranean coast of Northwest Africa, midway between the Atlantic Ocean and the Nile Delta. It is bordered by Algeria on the west (965 km) and southwest and Libya on the south east (459 km). [ 135 ] It lies between latitudes 30° and 38°N, and longitudes 7° and 12°E.
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