diff --git a/examples/SpectralMethod/Polycrystal/shearXY.yaml b/examples/SpectralMethod/Polycrystal/shearXY.yaml
index 35ebd28ea..ec714f971 100644
--- a/examples/SpectralMethod/Polycrystal/shearXY.yaml
+++ b/examples/SpectralMethod/Polycrystal/shearXY.yaml
@@ -1,7 +1,7 @@
 step:
   - mech:
-      dotF: [0, 0, 0,  1e-3, 0, 0,  0, 0, 0]
-      P:    [x, x, x,     x, x, x,  x, x, x]
+      dot_F: [0, 0, 0,  1e-3, 0, 0,  0, 0, 0]
+      P:     [x, x, x,     x, x, x,  x, x, x]
     discretization:
       t: 60
       N: 120
diff --git a/examples/SpectralMethod/Polycrystal/shearZX.yaml b/examples/SpectralMethod/Polycrystal/shearZX.yaml
index cba4fffd5..473a82fc7 100644
--- a/examples/SpectralMethod/Polycrystal/shearZX.yaml
+++ b/examples/SpectralMethod/Polycrystal/shearZX.yaml
@@ -1,7 +1,7 @@
 step:
   - mech:
-      dotF: [0, 0, 1e-3, 0, 0, 0, 0, 0, 0]
-      P:    [x, x,    x, x, x, x, x, x, x]
+      dot_F: [0, 0, 1e-3, 0, 0, 0, 0, 0, 0]
+      P:     [x, x,    x, x, x, x, x, x, x]
     discretization:
       t: 60
       N: 120
diff --git a/examples/SpectralMethod/Polycrystal/tensionX.yaml b/examples/SpectralMethod/Polycrystal/tensionX.yaml
index 5761b987d..5c82d0eec 100644
--- a/examples/SpectralMethod/Polycrystal/tensionX.yaml
+++ b/examples/SpectralMethod/Polycrystal/tensionX.yaml
@@ -1,14 +1,14 @@
 step:
   - mech:
-      dotF: [1.0e-3,0,0,  0,x,0,  0,0,x]
-      P:    [     x,x,x,  x,0,x,  x,x,0]
+      dot_F: [1.0e-3,0,0,  0,x,0,  0,0,x]
+      P:     [     x,x,x,  x,0,x,  x,x,0]
     discretization:
       t: 10
       N: 40
       f_out: 4
   - mech:
-      dotF: [1.0e-3,0,0,  0,x,0,  0,0,x]
-      P:    [     x,x,x,  x,0,x,  x,x,0]
+      dot_F: [1.0e-3,0,0,  0,x,0,  0,0,x]
+      P:     [     x,x,x,  x,0,x,  x,x,0]
     discretization:
       t: 60
       N: 60