diff --git a/src/darsia/utils/plotting.py b/src/darsia/utils/plotting.py
index 1ea79e6e..bad7037c 100644
--- a/src/darsia/utils/plotting.py
+++ b/src/darsia/utils/plotting.py
@@ -16,32 +16,28 @@
 
 
 def plot_2d_wasserstein_distance(
-    grid: darsia.Grid,
-    mass_diff: np.ndarray,
-    flux: np.ndarray,
-    pressure: np.ndarray,
-    transport_density: np.ndarray,
+    info: dict,
     **kwargs,
 ) -> None:
-    """Plot the 2d Wasserstein distance between two mass distributions.
-
-    The inputs are assumed to satisfy the layout of the Beckman solution.
+    """Post-processing utility to plot the 2d Wasserstein distance.
 
     Args:
-        grid (darsia.Grid): grid
-        mass_diff (np.ndarray): difference of mass distributions
-        flux (np.ndarray): fluxes
-        pressure (np.ndarray): pressure
-        transport_density (np.ndarray): transport density
-        kwargs: additional keyword arguments
+        info (dict): information about the Beckman solution, output of
+            darsia.wasserstein_distance.
 
     """
+    # Fetch fields
+    grid = info["grid"]
+    mass_diff = info["mass_diff"]
+    flux = info["flux"]
+    pressure = info["pressure"]
+    transport_density = info["transport_density"]
+
     # Fetch options
-    name = kwargs.get("name", None)
+    path = kwargs.get("path", None)
     save_plot = kwargs.get("save", False)
     if save_plot:
-        folder = kwargs.get("folder", ".")
-        Path(folder).mkdir(parents=True, exist_ok=True)
+        Path(path).mkdir(parents=True, exist_ok=True)
         dpi = kwargs.get("dpi", 500)
     show_plot = kwargs.get("show", True)
 
@@ -66,7 +62,7 @@ def plot_2d_wasserstein_distance(
     # Save the plot
     if save_plot:
         plt.savefig(
-            folder + "/" + name + "_beckman_solution_pressure.png",
+            Path(str(path) + "_beckman_solution_pressure.png"),
             dpi=dpi,
             transparent=True,
         )
@@ -90,7 +86,7 @@ def plot_2d_wasserstein_distance(
     # Save the plot
     if save_plot:
         plt.savefig(
-            folder + "/" + name + "_beckman_solution_fluxes.png",
+            Path(str(path) + "_beckman_solution_fluxes.png"),
             dpi=dpi,
             transparent=True,
         )
@@ -105,7 +101,7 @@ def plot_2d_wasserstein_distance(
     # Save the plot
     if save_plot:
         plt.savefig(
-            folder + "/" + name + "_beckman_solution_transport_density.png",
+            Path(str(path) + "_beckman_solution_transport_density.png"),
             dpi=dpi,
             transparent=True,
         )
@@ -218,6 +214,9 @@ def to_vtk(
                     img = (img[1], img[2], img[0])
             cellData[name] = img
 
+        # Make directory if necessary
+        Path(path).mkdir(parents=True, exist_ok=True)
+
         # Write to VTK
         gridToVTK(str(Path(path)), x, y, z, cellData=cellData)