What are the properties of synthetic fuels

The properties of synthetic fuels are that they have little to none sulfur,  low aromatics and polyaromatics content, has no color and odor.

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Explanation:

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: