diff --git a/DiffractionGratings/grating3D.pro b/DiffractionGratings/grating3D.pro
index 1bc873bd94b2a0dc9929046ec2871f5b863e3d75..4dde9ddb017ce164afd2bf1c8f0e474baaa33eec 100644
--- a/DiffractionGratings/grating3D.pro
+++ b/DiffractionGratings/grating3D.pro
@@ -165,7 +165,7 @@ Function{
   ts[] =    2.*k1z[] /(k1z[]+k2z[]);
   rp[] = (k1z[]*epsr2[]-k2z[]*epsr1[])/(k1z[]*epsr2[]+k2z[]*epsr1[]);
   tp[] =            (2.*k1z[]*epsr2[])/(k1z[]*epsr2[]+k2z[]*epsr1[]);
-  
+
   spol[]    = Vector[Sin[phi0],-Cos[phi0],0];
   AmplEis[] =      spol[];
   AmplErs[] = rs[]*spol[];