featureclass

Styling line features Adjust the line style in the configuration of a line Feature-class Choose between solid, dashed, or doted line styles    

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There is no explicit restriction on the feature symbol size, although the smaller is the better. Otherwise, the map will be overloaded when features are very close to each other. 16×16 or 32×32 in screen resolution (96 dpi) should be fine.

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