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Sidebars Most TV screens and programming were designed using a 4:3 aspect ratio for standard-definition TV reception and viewing. However, most HDTVs are "widescreen," which use an aspect ratio of 16:9. Therefore, when a standard-definition program is viewed on a widescreen HDTV, the HDTV may center the image on the screen with black or gray margins (known as sidebars) ...
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