diff --git a/figs/apa_meas_k_time.pdf b/figs/apa_meas_k_time.pdf
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diff --git a/figs/frf_dvf_plant_coh.pdf b/figs/frf_dvf_plant_coh.pdf
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diff --git a/figs/frf_dvf_plant_tf.pdf b/figs/frf_dvf_plant_tf.pdf
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diff --git a/figs/frf_dvf_zoom_res_plant_tf.pdf b/figs/frf_dvf_zoom_res_plant_tf.pdf
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diff --git a/figs/frf_iff_plant_coh.pdf b/figs/frf_iff_plant_coh.pdf
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diff --git a/figs/frf_iff_plant_tf.pdf b/figs/frf_iff_plant_tf.pdf
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diff --git a/figs/frf_iff_plant_tf.png b/figs/frf_iff_plant_tf.png
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diff --git a/test-bench-apa300ml.org b/test-bench-apa300ml.org
index 907ae21..a27da87 100644
--- a/test-bench-apa300ml.org
+++ b/test-bench-apa300ml.org
@@ -1863,7 +1863,7 @@ We get the frequency vector that will be the same for all the frequency domain a
 #+end_src
 
 *** FRF Identification - DVF
-In this section, the dynamics from $V_a$ to $d_e$ is identified.
+In this section, the dynamics from excitation voltage $V_a$ to encoder measured displacement $d_e$ is identified.
 
 We compute the coherence for 2nd and 3rd identification:
 #+begin_src matlab
@@ -1931,7 +1931,6 @@ end
 #+end_src
 
 The obtained transfer functions are shown in Figure [[fig:frf_dvf_plant_tf]].
-
 They are all superimposed except for the APA7.
 
 #+begin_question
@@ -1943,10 +1942,6 @@ The encoder seems fine (it measured the same as the Interferometer).
 Maybe it could be due to the amplifier?
 #+end_question
 
-#+begin_question
-Why is there a double resonance at around 94Hz?
-#+end_question
-
 #+begin_src matlab :exports none
 figure;
 tiledlayout(3, 1, 'TileSpacing', 'None', 'Padding', 'None');
@@ -1991,6 +1986,15 @@ exportFig('figs/frf_dvf_plant_tf.pdf', 'width', 'wide', 'height', 'tall');
 #+RESULTS:
 [[file:figs/frf_dvf_plant_tf.png]]
 
+A zoom on the main resonance is shown in Figure [[fig:frf_dvf_zoom_res_plant_tf]].
+It is clear that expect for the APA 7, the response around the resonances are well matching for all the APA.
+
+It is also clear that there is not a single resonance but two resonances, a first one at 95Hz and a second one at 105Hz.
+
+#+begin_question
+Why is there a double resonance at around 94Hz?
+#+end_question
+
 #+begin_src matlab :exports none
 figure;
 tiledlayout(3, 1, 'TileSpacing', 'None', 'Padding', 'None');
@@ -2018,6 +2022,7 @@ set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
 xlabel('Frequency [Hz]'); ylabel('Phase [deg]');
 hold off;
 yticks(-360:90:360);
+ylim([-10, 180]);
 
 linkaxes([ax1,ax2],'x');
 xlim([80, 120]);
@@ -2128,7 +2133,7 @@ hold off;
 set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
 xlabel('Frequency [Hz]'); ylabel('Phase [deg]');
 hold off;
-yticks(-360:90:360);
+yticks(-360:90:360); ylim([-180, 180]);
 
 linkaxes([ax1,ax2],'x');
 xlim([10, 2e3]);