Position angles (PA; measured counterclockwise from north) of the different sectors used in the analysis of the intensity variations in the arcs (see Fig. 4).
|Sector 0||320°–330°||Sector 4||125°–150°|
|Sector 1||300°–330°||Sector 5||65°–95°|
|Sector 2||255°–280°||Sector 6||17.5°–35°|
|Sector 3||185°–215°||Sector 7||0°–17.5°|
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