The good one: Two horizontal lines, one very close to one of the long edges, the other one 1/3 from the top. Note that tilting and rotating the camera is allowed, as well as changing the distance.
A bad one: The horizontal lines are in the proper position (at the bottom, at least), but they are not running from one edge to the other. I need lines covering the full width.
Another bad one: All horizontal lines are too far away from the long edges. Put one line insanely mind-bogglingly staggeringly close to the edge.
Now go back to the upload page.