diff --git a/src/webactogram/webactogram.py b/src/webactogram/webactogram.py
index 6a4c63a..43415c0 100644
--- a/src/webactogram/webactogram.py
+++ b/src/webactogram/webactogram.py
@@ -437,7 +437,8 @@ def apply_median_blurring(self):
 
         def define_pcolormesh_args(self):
             """ define the x, y and z (color) data structure for plotting later on """
-            xx, yy, zz = self.act.dd, self.act.h2, np.tile(self.pcm['z'], (2, 1))  # tile the z array to create a 2D array
+            xx, yy, zz = self.act.dd, self.act.h2, self.pcm['z']
+            zz = np.vstack((zz, np.pad(zz, ((0,0),(0,1)))[:, 1:]))
 
             if not self.act.landscape:  # if vertical
                 xx, yy = yy, xx  # swap the x and y arrays