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<p>bits.<br/>
***<b>Q Mode 1</b>: In this mode, the data bits contain the <a href="page.php?w=Compact_Disc_Digital_Audio">Table of Contents</a> of the <a href="page.php?w=Session_%28CD%29">session</a> (if the Q channel is in the lead-in area), or timing information for the current track (if the Q channel is in the program and lead-out areas of a session).<br/>
***<b>Q Mode 2</b>: In this mode, the data bits contain the <a href="page.php?w=Media_Catalog_Number">Media Catalog Number</a> (MCN) of the disc.<br/>
***<b>Q Mode 3</b>: In this mode, the</p><p>
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