In the guide grid on iPhone/iPad/AppleTV there are light purple lines that run under each listed program. What are they for?
My first guess was that they represent progress in the program. Many extend to just under the now-dot in the timeline and would seem to express how much has been played.
But about half are at other lengths sometimes stretching a half hour into the future.
They look like download progress indicators but that would not be applicable as dozens of programs are not downloading.
What are they for?