Hello!!I wonder how further soften the contours, because you only have the options on the Advanced tab and line linestring. Ie to establish contour with a spline.
can you please tell us which software and version are you using?
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Take a look at this blog. It may have the answer to your question:
communities.bentley.com/.../created-a-surface-from-contours-but-not-getting-the-same-contours-as-imported-how-can-the-contours-appear-smoother.aspx