diff --git a/daqviewer/daqviewer.py b/daqviewer/daqviewer.py
index 3ec5714..9f3442c 100644
--- a/daqviewer/daqviewer.py
+++ b/daqviewer/daqviewer.py
@@ -87,7 +87,7 @@ def parse_contents(contents, filename):
     Input('upload-data', 'contents'),
     Input('upload-data', 'filename'),
 ])
-def update_output(contents, name):
+def csv_to_json(contents, name):
     if contents is not None:
         return parse_contents(contents, name)
 
@@ -136,7 +136,15 @@ def read_json_data(json_data):
         trace = go.Scatter(x=S.args, y=S.data, name=col, opacity=0.8)
         spec.append(trace)
 
-    graph_energy = dcc.Graph(id='energy-spectrum', figure={'data': spec})
+    graph_energy = dcc.Graph(id='energy-spectrum',
+                             figure={
+                                 'data': spec,
+                                 'layout': {
+                                     'xaxis': {
+                                         'range': [0, 3]
+                                     }
+                                 }
+                             })
 
     # Add location column
     dfs['location'] = dfs.index