> I mean 4x the number of pixels (2x lines + 2x columns).

http://en.wikipedia.org/wiki/Image:Common_Video_Resolutions.svg

I was looking for that before but couldn't find it...

Also I found a few screen-caps:

This is from normal digital terrestial TV:

http://www.oreillynet.com/mac/blog/images/0604DoraCreds2b-x.jpg

This is from some US HD channel:

http://www.bur.st/~anthony/dba/160206/stateoftheunion_1.jpg

Now, if you can't tell the difference...

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