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contour_level 0
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This is the default. Only the "outer" contours in the selection polygon are selected. See the part labeled 0 as shown in the following figure: Contour Levels.
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contour_level 1
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In addition to the outer contours, the first contours encountered within the outer contours are selected. See the part labeled 1 as shown in following figure: Contour Levels.
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contour_level 2
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In addition to the contours in contour level 1 (including all level 0 contours), the first contours encountered within level 1 contours are selected. See the part labeled 2 as shown in the following figure: Contour Levels.
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contour_level 3
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In addition to the contours in contour level 2 (including all level 1 and level 0 contours), the first contours encountered within level 2 contours are selected. See the part labeled 3 as shown in the following figure: Contour Levels.
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