calibcant/procedure.tex: Describe colors in fig:calibcant:bump caption

Prof. Cruz was unclear about what was what in the first panel, and
didn't notice that the approach/retract doubling also applied to the
first panel.

diff --git a/src/calibcant/procedure.tex b/src/calibcant/procedure.tex
index 0e9ca4a5de9839d8787b60452804ca7931f09dd0..26ac898658281fc218f1c4cc6c2772a267c4c62f 100644 (file)
--- a/src/calibcant/procedure.tex
+++ b/src/calibcant/procedure.tex
@@ -36,11 +36,14 @@ during this approach--retract cycle is analyzed to measure $\sigma_p$
   \begin{center}
     \includegraphics[width=0.8\textwidth]{figures/calibcant/bump.png}
     \caption{Measuring the photodiode sensitivity $\sigma_p$ by
-      bumping the cantilever tip on the substrate surface.  The second
-      panel shows the residual (measured data minus modeled data) for
-      the bump.  There are two deflection measurements at each
-      position, one from the approach phase, and one from the
-      retraction phase.  This is the first bump from the
+      bumping the cantilever tip on the substrate surface.  In the
+      first panel, the blue dots are experimental data, the green line
+      is the heuristic guess at initial fitting parameters, and the
+      red line is the optimized fit.  The second panel shows the
+      residual (measured data minus modeled data) for the bump.  In
+      both panels, there are two deflection measurements at each
+      position, one taken during the approach phase and another taken
+      during the retraction phase.  This is the first bump from the
       2013-02-07T08-20-46 calibration.\label{fig:calibcant:bump}}
   \end{center}
 \end{figure}