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@PhilippJFR @geopandas @HoloViews @HoloViz_org Negative offset values usually draw a line to the left of the original and positive offsets to the right, e.g. docs.safe.com/fme/2018.1/html/FME_Desktop_Documentation/FME_Transformers_HelpPane/Transformers/offsetcurvegenerator.htm