diff --git a/PlottingTool.mlapp b/PlottingTool.mlapp
index 4f9eecc..ee1ea30 100644
Binary files a/PlottingTool.mlapp and b/PlottingTool.mlapp differ
diff --git a/README.md b/README.md
index f90bcf9..b391b76 100644
--- a/README.md
+++ b/README.md
@@ -115,8 +115,7 @@ One last disclaimer: If there is a mistake in the data set, if you use a comma i
 There are numerous functionalities still missing. The following list provides an overview of all important functions, that should be added as soon as possible (more or less). The order of precedence represents the priority.
 
 1. Merge plots (more than one data set in a single plot) – Maybe another tool for that?
-4. Add a custom x-axis label
-5. Add the option for a derivation plot
-6. Add try and catch statements around every user input
+2. Get the custom x-Axis label to work on the fourier plot
+3. Add try and catch statements around every user input
 
 You are very welcome to help develop this tool further. If you are planning to do so, please send me a message (Max Heckmann) and I give you a short introduction in the already existing code. This probably saves you some time.
\ No newline at end of file
diff --git a/diffPlotFnc.m b/diffPlotFnc.m
index c0ac404..7661601 100644
--- a/diffPlotFnc.m
+++ b/diffPlotFnc.m
@@ -1,4 +1,4 @@
-function diffPlotFnc(data, fileSettings, checkboxes, start, stop, yAxis, xAxis, channels, path, order)
+function diffPlotFnc(data, fileSettings, checkboxes, start, stop, yAxis, xAxis, channels, path)
     
     %Iterate through all channels
     for channel = 1:width(data)
@@ -43,6 +43,10 @@ function diffPlotFnc(data, fileSettings, checkboxes, start, stop, yAxis, xAxis,
             figure(channel)
             plot(timeArray, yData, '-b');
             hold all
+            
+            %shorten time array to match lost value from diff
+            timeArray(end) = [];
+
             plot(timeArray, diff(yData), '-r');
             ylabel(yAxis{channel}.Value);
             xlabel(xAxis{channel}.Value);
@@ -50,7 +54,7 @@ function diffPlotFnc(data, fileSettings, checkboxes, start, stop, yAxis, xAxis,
             title(channels{channel});
             
             %Save plot
-            saveFigs('median', figure(channel), channels(channel), path, fileSettings{1}.Value)
+            saveFigs('derivative', figure(channel), channels(channel), path, fileSettings{1}.Value)
             
             %reset
             hold off
diff --git a/fourierPlotFnc.m b/fourierPlotFnc.m
index d66bc70..795b630 100644
--- a/fourierPlotFnc.m
+++ b/fourierPlotFnc.m
@@ -47,7 +47,7 @@ function fourierPlotFnc(data, fileSettings, checkboxes, start, stop, yAxis, xAxi
                 Nspec = 1024;
             end
             wspec = hamming(Nspec);
-            Noverlap = Nspec/2;
+            Noverlap = int16(Nspec/2);
 
             hold on
             figure(channel)