d perpendicular to the reference surface3.3.bined surface imperfection depthSIMcddistance between the reference surface and the lowermost point of the surface imperfection, measured from and perpendicular to the reference surface3.4 single surface imperfection heightSIMshgreatest height of the surface imperfection, measured from and perpendicular to the reference surface3.4.bined surface imperfection heightSIMchdistance between the reference surface and the uppermost point of the surface imperfection, measured from and perpendicular to the reference surface3.5 surface imperfection areaSIMaarea of a single surface imperfection projected onto the reference surfaceLicensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sat Aug 12 08:08:43 BST 2006, Uncontrolled Copy, (c) BSI