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• 14:14, 14 August 2009 John Creighton (talk | contribs) uploaded File:SILL Matrix.JPG (The above shows a 3D SILL Section matrix. The required reliability of a safety function is dependent both on the severity of an event and the likelihood of an event. http://www.isa.org/Content/Microsites838/Safety_Division/Home818/ISA_2004_Safety_Pape)