diff --git a/DataForControls.py b/DataForControls.py
index 6dcf3ae..a789aac 100644
--- a/DataForControls.py
+++ b/DataForControls.py
@@ -46,7 +46,13 @@
                      ]
 
 # these require additional user input - available in zunzunsite3 but not this project
-excludedModuleNames = [
+excludedModuleNames_2D = [
+    'Polyfunctional',
+    'Rational',
+    'Spline',
+    'UserDefinedFunction',
+]
+excludedModuleNames_3D = [
     'Polyfunctional',
     'Spline',
     'UserDefinedFunction',
@@ -55,7 +61,7 @@
 eq_od2D = collections.OrderedDict()
 for submodule in inspect.getmembers(pyeq3.Models_2D):
     if inspect.ismodule(submodule[1]):
-        if submodule[0] in excludedModuleNames:
+        if submodule[0] in excludedModuleNames_2D:
             continue
         eq_od2D[submodule[0]] = collections.OrderedDict()
         for equationClass in inspect.getmembers(submodule[1]):
@@ -80,7 +86,7 @@
 eq_od3D = collections.OrderedDict()
 for submodule in inspect.getmembers(pyeq3.Models_3D):
     if inspect.ismodule(submodule[1]):
-        if submodule[0] in excludedModuleNames:
+        if submodule[0] in excludedModuleNames_3D:
             continue
         eq_od3D[submodule[0]] = collections.OrderedDict()
         for equationClass in inspect.getmembers(submodule[1]):
diff --git a/FittingInterface.py b/FittingInterface.py
index b0e95f0..50f5ed2 100644
--- a/FittingInterface.py
+++ b/FittingInterface.py
@@ -77,7 +77,6 @@ def __init__(self, parent):
         f.grid(column=col, row=row)
         self.cb_Modules2D = tk.ttk.Combobox(f, state='readonly')
         moduleNameList = list(dfc.eq_od2D.keys())
-        moduleNameList.remove('Rational') # has no 2D equations used here
         self.cb_Modules2D['values'] = moduleNameList
         self.cb_Modules2D.bind("<<ComboboxSelected>>", self.moduleSelectChanged_2D)
         self.cb_Modules2D.set('Polynomial')