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Table 1

List of the colours and symbols used to depict the elements of the 3D skeletons drawn in the 3D magnetic topology figures.

Topological feature Colour Symbol/Line style

negative null point blue dot
positive null point red dot
negative separatrix surface field lines light blue thin lines
positive separatrix surface field lines pink thin lines
negative spines purple thick lines/crosses
positive spines orange thick lines/crosses
HCS null-line green thick line(s)
HCS curtain field lines green thin lines
bald-patch separatrix surface field lines olive green thin lines
separators yellow thick lines/stars

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