/usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/Themes/Ambiance/artwork/PageHeaderBaseDividerLight@18.sci is in ubuntu-ui-toolkit-theme 1.3.1918+16.04.20160404-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | border.top: 4
border.bottom: 0
border.left: 0
border.right: 0
source: PageHeaderBaseDividerLight@18.png
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