diff --git a/src/couple_diff_arctan.h b/src/couple_diff_arctan.h
index 14a9e1d..34249ef 100644
--- a/src/couple_diff_arctan.h
+++ b/src/couple_diff_arctan.h
@@ -5,8 +5,8 @@
 using std::vector;
 
 class CoupleDiffArctan : public Couple {
- CoupleDiffArctan();
- CoupleDiffArctan(CoupleDiffArctan&);
+  CoupleDiffArctan();
+  CoupleDiffArctan(CoupleDiffArctan&);
  protected:
   double nu_min, nu_max;
   double t_half_down, t_half_up;
@@ -18,11 +18,11 @@ class CoupleDiffArctan : public Couple {
   vector<double> deltanu;
 
  public:
-   void init( Configf& configf );
-   void step(void);
-   void find(void);
+  void init( Configf& configf );
+  void step(void);
+  void find(void);
   CoupleDiffArctan( int nodes, double deltat, int index,
-          const Propag& prepropag, const Population& postpop, double tempf );
+                    const Propag& prepropag, const Population& postpop, double tempf );
   virtual ~CoupleDiffArctan(void);
 };