diff --git a/demo.m b/demo.m
index a3330a3..a169e9e 100644
--- a/demo.m
+++ b/demo.m
@@ -26,7 +26,7 @@
 
 %% Set Toolbox version and help paths
 gui.config.name_toolbox = 'NIMS';
-gui.config.version_toolbox = '3.0';
+gui.config.version_toolbox = '3.1';
 gui.config.url_help = 'http://nims.readthedocs.org/en/latest/';
 gui.config.pdf_help = 'https://media.readthedocs.org/pdf/nims/latest/nims.pdf';
 
diff --git a/doc/_pictures/GUI_Main_Window.png b/doc/_pictures/GUI_Main_Window.png
index 9d4e967..40ce430 100644
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diff --git a/doc/_pictures/GUI_Main_Window_Efilm_curve.png b/doc/_pictures/GUI_Main_Window_Efilm_curve.png
index cc3890a..f0979c8 100644
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diff --git a/doc/_pictures/GUI_Main_Window_Esample_curve.png b/doc/_pictures/GUI_Main_Window_Esample_curve.png
index 44a64c9..da47cfe 100644
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diff --git a/doc/_pictures/GUI_Main_Window_Lh_curve.png b/doc/_pictures/GUI_Main_Window_Lh_curve.png
index f379f75..9341524 100644
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