diff --git a/nass-fem.org b/nass-fem.org
index 8c1df44..8bf4837 100644
--- a/nass-fem.org
+++ b/nass-fem.org
@@ -1203,7 +1203,7 @@ Procedure:
 **** Introduction                                                  :ignore:
 
 Validation with Amplified Piezoelectric Actuator, because:
-- is a good candidate for the nano-hexapod (as will be explained in Section ref:sec:detail_fem_apa)
+- is a good candidate for the nano-hexapod (as will be explained in Section ref:sec:detail_fem_actuator)
 - had one in the lab for experimental testing (APA95ML, Figure ref:fig:detail_fem_apa95ml_picture)
   It is composed of several piezoelectric stacks (arranged horizontally, in blue), and a shell (in red) that amplifies the motion. The working direction of the APA95ML is vertical.
 - permits to model a mechanical structure (similar to a flexible joint), piezoelectric actuator and piezoelectric sensor
@@ -1236,7 +1236,7 @@ Quick explanation of APA:
 
 - explain how the FEM is done:
   - material properties (Table ref:tab:detail_fem_material_properties)
-  - mesh (Figure ref:fig:detail_fem_apa95ml_fem)
+  - mesh (Figure ref:fig:detail_fem_apa95ml_mesh)
 - explain piezoelectric materials:
   - sensors
   - actuators
@@ -1335,7 +1335,7 @@ From [[cite:&fleming14_desig_model_contr_nanop_system p. 123]], the relation bet
 \end{subequations}
 
 Unfortunately, it is difficult to know exactly which material is used in the amplified piezoelectric actuator[fn:1].
-However, based on the available properties of the stacks in the data-sheet (summarized in Table ref:tab:stack_parameters), the soft Lead Zirconate Titanate "THP5H" from Thorlabs seemed to match quite well the observed properties.
+However, based on the available properties of the stacks in the data-sheet (summarized in Table ref:tab:detail_fem_stack_parameters), the soft Lead Zirconate Titanate "THP5H" from Thorlabs seemed to match quite well the observed properties.
 The properties of this "THP5H" material used to compute $g_a$ and $g_s$ are listed in Table ref:tab:test_apa_piezo_properties.
 
 From these parameters, $g_s = 5.1\,V/\mu m$ and $g_a = 26\,N/V$ were obtained.
diff --git a/nass-fem.pdf b/nass-fem.pdf
index 8a61090..7e0e4bb 100644
Binary files a/nass-fem.pdf and b/nass-fem.pdf differ
diff --git a/nass-fem.tex b/nass-fem.tex
index 676a75e..f817a2f 100644
--- a/nass-fem.tex
+++ b/nass-fem.tex
@@ -1,4 +1,4 @@
-% Created 2025-02-25 Tue 19:02
+% Created 2025-02-25 Tue 19:07
 % Intended LaTeX compiler: pdflatex
 \documentclass[a4paper, 10pt, DIV=12, parskip=full, bibliography=totoc]{scrreprt}
 
@@ -95,7 +95,7 @@ typically from hundred thousands to less than 100 DoF
 \label{ssec:detail_fem_super_element_validation}
 Validation with Amplified Piezoelectric Actuator, because:
 \begin{itemize}
-\item is a good candidate for the nano-hexapod (as will be explained in Section \ref{sec:detail_fem_apa})
+\item is a good candidate for the nano-hexapod (as will be explained in Section \ref{sec:detail_fem_actuator})
 \item had one in the lab for experimental testing (APA95ML, Figure \ref{fig:detail_fem_apa95ml_picture})
 It is composed of several piezoelectric stacks (arranged horizontally, in blue), and a shell (in red) that amplifies the motion. The working direction of the APA95ML is vertical.
 \item permits to model a mechanical structure (similar to a flexible joint), piezoelectric actuator and piezoelectric sensor
@@ -132,7 +132,7 @@ Stiffness & \(N/\mu m\) & 16\\
 \item explain how the FEM is done:
 \begin{itemize}
 \item material properties (Table \ref{tab:detail_fem_material_properties})
-\item mesh (Figure \ref{fig:detail_fem_apa95ml_fem})
+\item mesh (Figure \ref{fig:detail_fem_apa95ml_mesh})
 \end{itemize}
 \item explain piezoelectric materials:
 \begin{itemize}
@@ -250,7 +250,7 @@ From \cite[p. 123]{fleming14_desig_model_contr_nanop_system}, the relation betwe
 \end{subequations}
 
 Unfortunately, it is difficult to know exactly which material is used in the amplified piezoelectric actuator\footnote{The manufacturer of the APA95ML was not willing to share the piezoelectric material properties of the stack.}.
-However, based on the available properties of the stacks in the data-sheet (summarized in Table \ref{tab:stack_parameters}), the soft Lead Zirconate Titanate ``THP5H'' from Thorlabs seemed to match quite well the observed properties.
+However, based on the available properties of the stacks in the data-sheet (summarized in Table \ref{tab:detail_fem_stack_parameters}), the soft Lead Zirconate Titanate ``THP5H'' from Thorlabs seemed to match quite well the observed properties.
 The properties of this ``THP5H'' material used to compute \(g_a\) and \(g_s\) are listed in Table \ref{tab:test_apa_piezo_properties}.
 
 From these parameters, \(g_s = 5.1\,V/\mu m\) and \(g_a = 26\,N/V\) were obtained.