Cropped and version of public domain work to isolate the grid fins.
<a href="https://en.wikipedia.org/wiki/User:Fl295" class="extiw" title="en:User:Fl295">en:User:Fl295</a> (original photo) &amp; <a href="https://en.wikipedia.org/wiki/User:Father_Goose" class="extiw" title="en:User:Father Goose">User:Father Goose</a> (cropping)
<span class="int-own-work" lang="en">Own work</span>