diff --git a/freesif/data/strucdata.py b/freesif/data/strucdata.py
index a279c34..f7e58f5 100644
--- a/freesif/data/strucdata.py
+++ b/freesif/data/strucdata.py
@@ -281,12 +281,14 @@ class FirstLevelData(StrucData):
          [(1+s3),        (1-s3),        (1+s3),        (1-s3)       ]]) * .25
 
     # 6-node triangles
-    xtri = np.array([[ 5./3, -1./3, -1./3],
-                     [ 2./3,  2./3, -1./3],
-                     [-1./3,  5./3, -1./3],
-                     [-1./3,  2./3,  2./3],
-                     [-1./3, -1./3,  5./3],
-                     [ 2./3, -1./3,  2./3]])
+    xtri = np.array([
+        [5 / 3, -1 / 3, -1 / 3],
+        [-1 / 3, 5 / 3, -1 / 3],
+        [-1 / 3, -1 / 3, 5 / 3],
+        [2 / 3, 2 / 3, -1 / 3],
+        [-1 / 3, 2 / 3, 2 / 3],
+        [2 / 3, -1 / 3, 2 / 3]
+    ])
 
     # 3-node beam
     xbm3 = np.array([[1. + s3, 1. - s3],