Corresponds to the isolines of multiple equidistance of 5 m, refined within the areas measured at a factor of scale 1000 or 2000 with isolines at an equal distance of 2.5 m and where the slope is less than 5 % at an equidistance of 1 m Must be drawn seamlessly, possibly by interpolation in the presence of inhabited centres, roads, railways, artefacts, rivers, lakes, escarpments, rock or other. Each curve, at times, can therefore be of certain or uncertain determination.
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