Junction in tunnel of line through and shift by 2/4 from left, set "u"
<a href="//commons.wikimedia.org/wiki/User:YLSS" title="User:YLSS">YLSS</a> (modified by <a href="//commons.wikimedia.org/wiki/User:Jc86035" title="User:Jc86035">Jc86035</a>
2016-05-29
<a href="//commons.wikimedia.org/wiki/File:BSicon_uextSHI2g%2Bl.svg" title="File:BSicon uextSHI2g+l.svg">File:BSicon uextSHI2g+l.svg</a>