| 31. | The contour line image would need to become semi-transparant so that the map image shows through.
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| 32. | Elevations followed by a plus sign ( + ) were interpolated using topographic map contour lines.
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| 33. | It has been the primary method to plot contour lines on topographic maps since the 1930s.
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| 34. | The contour lines played a linking role.
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| 35. | But the region had remained unproductive before the innovation of building a segi along a contour line.
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| 36. | A level set is a generalization of a contour line for functions of any number of variables.
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| 37. | Part of the track follows the 750m contour line and there are rest benches along the way.
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| 38. | Because gas floats above oil, the thin red contour line marks the gas / oil contact zone
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| 39. | Because gas floats above oil, the thin red contour line marks the gas / oil contact zone.
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| 40. | Then I go in with a finer brush or pen to add details, texture or contour lines ."
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