Stroke config
1 2  | 
vl | 
 a Vega-Lite object  | 
stroke | 
 stroke color  | 
stroke_width | 
 stroke of the width in pixels  | 
stroke_dash | 
 an array of alternating stroke, space lengths for creating dashed or dotted lines.  | 
stroke_dash_offset | 
 the offset (in pixels) into which to begin drawing with the stroke dash array.  | 
stroke_opacity | 
 
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