Optionalcurve-The curving method used to separate two or more edges between two nodes; may be
Optionalline-The cap of the edge's line.
Optionalline-The colour of the edge’s line.
Optionalline-The dashed line offset.
Optionalline-The dashed line pattern which specifies alternating lengths of lines and gaps.
Optionalline-The filling style of the edge's line.
Optionalline-The opacity of the edge’s line and arrow. Useful if you wish to have a separate opacity for the edge label versus the edge line. Note that the opacity value of the edge element affects the effective opacity of its line and label subcomponents.
Value between 0 and 1 inclusive.
Optionalline-The style of the edge’s line.
Optionalsource-The distance the edge ends from its source.
Optionaltarget-The distance the edge ends from its target.
OptionalwidthThe width of an edge’s line.
These properties affect the styling of an edge’s line:
http://js.cytoscape.org/#style/edge-line