Points of desired elevation, at which contours are desired to be drawn, are interpolated in between observed points. Then, contours are drawn by joining points of equal elevation by smooth curves keeping in mind the principal characteristics of contour. They are then inked in, preferably in brown to distinguish them from other features. The contour value is written down in a gap in the line provided for the purpose. Every fifth contour is drawn bolder to make it distinguishable from the rest.

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