k-curve of parallel tracks from left, part across
<a href="//commons.wikimedia.org/wiki/User:YLSS" title="User:YLSS">YLSS</a>
2014-05-19
This <a href="https://en.wikipedia.org/wiki/vector_image" class="extiw" title="w:vector image">vector image</a> includes elements that have been taken or adapted from this file: