diff --git a/Code/Source/solver/VtkData.cpp b/Code/Source/solver/VtkData.cpp
index a357da38a..f6be28cb5 100644
--- a/Code/Source/solver/VtkData.cpp
+++ b/Code/Source/solver/VtkData.cpp
@@ -800,7 +800,7 @@ Array<double> VtkVtpData::get_points() const
 
 bool VtkVtpData::has_cell_data(const std::string& data_name)
 {
-  int num_arrays = impl->vtk_polydata->GetPointData()->GetNumberOfArrays();
+  int num_arrays = impl->vtk_polydata->GetCellData()->GetNumberOfArrays();
 
   for (int i = 0; i < num_arrays; i++) {
     if (!strcmp(impl->vtk_polydata->GetCellData()->GetArrayName(i), data_name.c_str())) {
@@ -1059,7 +1059,7 @@ void VtkVtuData::copy_points(Array<double>& points)
 
 bool VtkVtuData::has_cell_data(const std::string& data_name)
 {
-  int num_arrays = impl->vtk_ugrid->GetPointData()->GetNumberOfArrays();
+  int num_arrays = impl->vtk_ugrid->GetCellData()->GetNumberOfArrays();
 
   for (int i = 0; i < num_arrays; i++) {
     if (!strcmp(impl->vtk_ugrid->GetCellData()->GetArrayName(i), data_name.c_str())) {
diff --git a/tests/cases/cep/slab_domains/README.md b/tests/cases/cep/slab_domains/README.md
index 1295b64f0..28b9b0c2b 100755
--- a/tests/cases/cep/slab_domains/README.md
+++ b/tests/cases/cep/slab_domains/README.md
@@ -1,10 +1,12 @@
 
 # **Problem Description**
  
-Simulate the propagation of a planar wave in a slab with different domain conductances using the ten-Tusscher-Panfilov cell activation model.
+Simulate the propagation of a planar wave in a slab with different domain conductances using the ten-Tusscher-Panfilov cell activation model. The domains are specified in the `mesh/domainIDs.vtu` file.
 
 ![Slab domains visualization](domains.png)
 
+For reference, the domains are also specified in the `mesh/domainIDs.dat` and the inpute file `solver_dat.xml` can be used to run the test using the `.dat` domain file. Both approaches are equivalent.
+
 ## References
 K. H. W. J. ten Tusscher, D. Noble, P. J. Noble, and A. V. Panfilov. A model for human ventricular tissue. American Journal of Physiology-Heart and Circulatory Physiology,
 286(4):H1573–H1589, apr 2004.
diff --git a/tests/cases/cep/slab_domains/mesh/domain.txt b/tests/cases/cep/slab_domains/mesh/domain.txt
deleted file mode 100644
index ff6768cac..000000000
--- a/tests/cases/cep/slab_domains/mesh/domain.txt
+++ /dev/null
@@ -1,3360 +0,0 @@
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diff --git a/tests/cases/cep/slab_domains/mesh/domainIDs.dat b/tests/cases/cep/slab_domains/mesh/domainIDs.dat
new file mode 100644
index 000000000..55c7bf546
--- /dev/null
+++ b/tests/cases/cep/slab_domains/mesh/domainIDs.dat
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:beb81aa7f5e504c760721dc8efe85da32edd5b806ab388f6fab2fa821bc631fd
+size 6720
diff --git a/tests/cases/cep/slab_domains/mesh/domainIDs.vtu b/tests/cases/cep/slab_domains/mesh/domainIDs.vtu
new file mode 100644
index 000000000..c51b5dda5
--- /dev/null
+++ b/tests/cases/cep/slab_domains/mesh/domainIDs.vtu
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a92edcbde0bd634c1eb712a2f6fa60b543df1602e5b0e1844dad572f2772e317
+size 79692
diff --git a/tests/cases/cep/slab_domains/solver.xml b/tests/cases/cep/slab_domains/solver_dat.xml
similarity index 98%
rename from tests/cases/cep/slab_domains/solver.xml
rename to tests/cases/cep/slab_domains/solver_dat.xml
index 50fcfbd6f..fd626d280 100644
--- a/tests/cases/cep/slab_domains/solver.xml
+++ b/tests/cases/cep/slab_domains/solver_dat.xml
@@ -33,7 +33,7 @@
       <Face_file_path> ./mesh/surface_x20.vtp </Face_file_path>
     </Add_face>
 
-    <Domain_file_path> ./mesh/domain.txt </Domain_file_path>
+    <Domain_file_path> ./mesh/domainIDs.dat </Domain_file_path>
 
     <Mesh_scale_factor> 1.0 </Mesh_scale_factor>
   </Add_mesh>
diff --git a/tests/cases/cep/slab_domains/solver_vtu.xml b/tests/cases/cep/slab_domains/solver_vtu.xml
new file mode 100644
index 000000000..e82c3e8b2
--- /dev/null
+++ b/tests/cases/cep/slab_domains/solver_vtu.xml
@@ -0,0 +1,106 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<svMultiPhysicsFile version="0.1">
+
+  <GeneralSimulationParameters>
+    <Continue_previous_simulation> false </Continue_previous_simulation>
+    <Number_of_spatial_dimensions> 3 </Number_of_spatial_dimensions> 
+    <Number_of_time_steps> 20 </Number_of_time_steps> 
+    <Time_step_size> 0.1 </Time_step_size> 
+    <Spectral_radius_of_infinite_time_step> 0.50 </Spectral_radius_of_infinite_time_step> 
+    <Searched_file_name_to_trigger_stop> STOP_SIM </Searched_file_name_to_trigger_stop> 
+
+    <Save_results_to_VTK_format> true </Save_results_to_VTK_format> 
+    <Name_prefix_of_saved_VTK_files> result </Name_prefix_of_saved_VTK_files> 
+    <Increment_in_saving_VTK_files> 1 </Increment_in_saving_VTK_files> 
+    <Start_saving_after_time_step> 0 </Start_saving_after_time_step> 
+
+    <Increment_in_saving_restart_files> 1000 </Increment_in_saving_restart_files> 
+    <Convert_BIN_to_VTK_format> 0 </Convert_BIN_to_VTK_format> 
+
+    <Verbose> 1 </Verbose> 
+    <Warning> 1 </Warning> 
+    <Debug> 0 </Debug>
+  </GeneralSimulationParameters>
+
+  <Add_mesh name="block"> 
+    <Mesh_file_path> ./mesh/VOLUME.vtu </Mesh_file_path>
+
+    <Add_face name="x0">
+      <Face_file_path> ./mesh/surface_x0.vtp </Face_file_path>
+    </Add_face>
+
+    <Add_face name="x1">
+      <Face_file_path> ./mesh/surface_x20.vtp </Face_file_path>
+    </Add_face>
+
+    <Domain_file_path> ./mesh/domainIDs.vtu </Domain_file_path>
+
+    <Mesh_scale_factor> 1.0 </Mesh_scale_factor>
+  </Add_mesh>
+
+  <Add_equation type="CEP">
+
+    <Coupled> true </Coupled>
+    <Min_iterations> 1 </Min_iterations>  
+    <Max_iterations> 20 </Max_iterations> 
+    <Tolerance> 1e-10 </Tolerance> 
+
+    <Domain id="1">
+      <Electrophysiology_model> TTP </Electrophysiology_model>
+      <G_Na> 29.68 </G_Na> 
+      <G_CaL> 7.96e-5 </G_CaL>
+      <G_Kr> 0.31 </G_Kr>
+      <Myocardial_zone> epi </Myocardial_zone>
+      <Isotropic_conductivity> 0.033192 </Isotropic_conductivity>
+      <ODE_solver> RK </ODE_solver>
+    </Domain>
+
+    <Domain id="2">
+      <Electrophysiology_model> TTP </Electrophysiology_model>
+      <G_Na> 7.42  </G_Na> 
+      <G_CaL> 1.99e-5 </G_CaL>
+      <G_Kr> 0.08 </G_Kr>
+      <Myocardial_zone> epi </Myocardial_zone>
+      <Isotropic_conductivity> 0.033192 </Isotropic_conductivity>
+      <ODE_solver> RK </ODE_solver>
+    </Domain>
+
+    <Domain id="3">
+      <Electrophysiology_model> TTP </Electrophysiology_model>
+
+      <G_Na> 29.68 </G_Na> 
+      <G_CaL> 7.96e-5 </G_CaL>
+      <G_Kr> 0.31 </G_Kr>
+
+      <Myocardial_zone> epi </Myocardial_zone>
+
+      <Isotropic_conductivity> 0.033192 </Isotropic_conductivity>
+
+      <Stimulus type="Istim">
+        <Amplitude> -35.714 </Amplitude>
+        <Start_time> 0.0 </Start_time>
+        <Duration> 2.0 </Duration>
+        <Cycle_length> 10000.0 </Cycle_length>
+      </Stimulus>
+
+      <ODE_solver> RK4 </ODE_solver>      
+    </Domain>
+
+    <Output type="Spatial">
+      <Action_potential> true </Action_potential>
+    </Output>
+
+    <LS type="GMRES">
+      <Linear_algebra type="fsils">
+        <Preconditioner> fsils </Preconditioner>
+      </Linear_algebra>
+      <Max_iterations> 500 </Max_iterations>
+      <Tolerance> 1e-10 </Tolerance>
+      <Krylov_space_dimension> 50 </Krylov_space_dimension>
+    </LS>
+
+  </Add_equation>
+
+</svMultiPhysicsFile>
+
+
diff --git a/tests/test_cep.py b/tests/test_cep.py
index 9ad915dd0..f0e49c8f1 100644
--- a/tests/test_cep.py
+++ b/tests/test_cep.py
@@ -37,9 +37,11 @@ def test_cylinder_purkinje_1d3d(n_proc):
     run_with_reference(base_folder, test_folder, fields, n_proc)
 
 
-def test_slab_domains(n_proc):
+@pytest.mark.parametrize("domain_definition", ["dat", "vtu"])
+def test_slab_domains(domain_definition, n_proc):
     test_folder = "slab_domains"
-    run_with_reference(base_folder, test_folder, fields, n_proc, t_max=20)
+    name_inp = "solver_" + domain_definition + ".xml"
+    run_with_reference(base_folder, test_folder, fields, n_proc, t_max=20, name_inp=name_inp)
 
 
 @pytest.mark.parametrize(