20/07/ Evolution of D inventory on W ( ) tile 1: retention decreased by a factor of 2-10 from 2007 to 2009 BUT change from VPS tiles to other coatings tile 4/4B: thicker co-deposited layers below the inner strike point in 2009 than in 2007 or 2008 VPS tiles 2007 & 2008 Marker tile 2009 PVD tile 2007 Marker tiles 2008 & 2009 PVD tile 2007 Marker tiles 2008 & 2009
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