sawsim/discussion.tex: Add \sigma to the nomenclature

Thanks Mom!

diff --git a/src/sawsim/discussion.tex b/src/sawsim/discussion.tex
index 513279a0f90b03b2e135dc51261afa9f9b0ce5f4..2a4b6e1e45c8a8ea3f19e80195fdbe883602c603 100644 (file)
--- a/src/sawsim/discussion.tex
+++ b/src/sawsim/discussion.tex
@@ -205,6 +205,10 @@ rate.
 %
 \nomenclature{$r_{uF}$}{Unfolding loading rate (newtons per second)}
 \nomenclature{$\gamma_e$}{Euler-Macheroni constant, $\gamma_e=0.577\ldots$}
+\nomenclature{$\sigma$}{Standard deviation.  For example, $\sigma$ is
+  used as the standard deviation of an unfolding force distribution in
+  \cref{eq:sawsim:gumbel}.  Not to be confused with the photodiode
+  sensitivity $\sigma_p$.}
 
 From \cref{fig:sawsim:order-dep}, we see that the proper way to
 process data from mechanical unfolding experiments is to group the