diff --git a/dstat_interface/experiments/cv.py b/dstat_interface/experiments/cv.py
index fbeda5653354d01592b20cf5ca4bba310a81d527..c679603f184787ef687561468cbc38c37c73d300 100644
--- a/dstat_interface/experiments/cv.py
+++ b/dstat_interface/experiments/cv.py
@@ -13,10 +13,9 @@ class CVExp(Experiment):
         self.ylabel = "Current (A)"
         self.datalength = 2 * self.parameters['scans']  # x and y for each scan
         self.databytes = 6  # uint16 + int32
-        self.plot_format['current_voltage']['xlims'] = (
-            int(self.parameters['v1']),
-            int(self.parameters['v2'])
-            )
+        self.plot_format['current_voltage']['xlims'] = tuple(
+                sorted((int(self.parameters['v1']), int(self.parameters['v2'])))
+                )
         
         self.commands += "E"
         self.commands[2] += "C"
diff --git a/dstat_interface/experiments/lsv.py b/dstat_interface/experiments/lsv.py
index 9042a5e4c01fea7eaed4d595ede6f31fe89594fd..e4c7e47ae47c0c92425f2173abd822ed183178a4 100644
--- a/dstat_interface/experiments/lsv.py
+++ b/dstat_interface/experiments/lsv.py
@@ -12,10 +12,12 @@ class LSVExp(Experiment):
         self.datatype = "linearData"
         self.datalength = 2
         self.databytes = 6  # uint16 + int32
-        self.plot_format['current_voltage']['xlims'] = (
-            int(self.parameters['start']),
-            int(self.parameters['stop'])
-            )
+        self.plot_format['current_voltage']['xlims'] = tuple(
+                    sorted(
+                        (int(self.parameters['start']),
+                         int(self.parameters['stop']))
+                           )
+                )
         
         self.commands += "E"
         self.commands[2] += "L"
diff --git a/dstat_interface/experiments/swv.py b/dstat_interface/experiments/swv.py
index 2f3ba803da10e61f15078946485867b641081547..91f2ea75e047fa9f619fad28cacba4d7b17dbd69 100644
--- a/dstat_interface/experiments/swv.py
+++ b/dstat_interface/experiments/swv.py
@@ -38,11 +38,14 @@ class SWVExp(Experiment):
             'swv' : {'labels' : ('Voltage (mV)',
                                              'Current (A)'
                                              ),
-                     'xlims' : (int(self.parameters['start']),
-                                int(self.parameters['stop']))
+                     'xlims' : tuple(sorted(
+                                            (int(self.parameters['start']),
+                                             int(self.parameters['stop']))
+                                            )
+                                     )
                      }
             }
-        
+
         self.commands += "E"
         self.commands[2] += "S"
         self.commands[2] += str(self.parameters['clean_s'])
@@ -116,8 +119,11 @@ class DPVExp(SWVExp):
             'swv' : {'labels' : ('Voltage (mV)',
                                              'Current (A)'
                                              ),
-                     'xlims' : (int(self.parameters['start']),
-                                int(self.parameters['stop']))
+                     'xlims' : tuple(sorted(
+                                            (int(self.parameters['start']),
+                                             int(self.parameters['stop']))
+                                            )
+                                     )
                      }
             }