diff --git a/opamp_circuits_C_GARRETT/opamps.tex b/opamp_circuits_C_GARRETT/opamps.tex
index 318d2c6..2e629c5 100644
--- a/opamp_circuits_C_GARRETT/opamps.tex
+++ b/opamp_circuits_C_GARRETT/opamps.tex
@@ -522,9 +522,7 @@ we can now state that the {\fg} (as an entity in its own right) can fail in a nu
 In other words we have taken a {\fg}, and analysed how 
 \textbf{it} can fail according to the failure modes of its components, and then
 determined the {\fg} failure modes.
-%These new failure~modes are derived failure modes.
-%The ways in which the module can fail now becomes a new set of fault modes, the fault~modes
-%being derived from the {\fg}.
+
 \paragraph{Creating a derived component.} 
 We create a new `{\dc}' which has
 the failure symptoms of the {\fg} from which it was derived, as its set of failure modes.
diff --git a/related_papers_books/GESTRA_NRS_1-50-51_SIL3_EN.ppt b/related_papers_books/GESTRA_NRS_1-50-51_SIL3_EN.ppt
new file mode 100644
index 0000000..1a3b8d2
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