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Most plasma screen televisions support an array of standard definition and HDTV formats. The standard definition formats occur at two primary resolutions, 704 x 480 and 640 x 480, at either the 4:3 or 16:9 aspect ratios. The HDTV formats have resolutions of either 1920 x 1080 (referred to as 1080i) or 1280 x 720 (referred to as 720p), an both are shown at 16:9 aspect ratio. The 1080i signal is interlaced, meaning that the odd screen lines are scanned first, followed by the even ones every 30th of a second.