diff --git a/libLanlGeoMag/Lgm/Lgm_MagModelInfo.h b/libLanlGeoMag/Lgm/Lgm_MagModelInfo.h
index 9f18809f..4ed3d953 100644
--- a/libLanlGeoMag/Lgm/Lgm_MagModelInfo.h
+++ b/libLanlGeoMag/Lgm/Lgm_MagModelInfo.h
@@ -142,11 +142,13 @@ typedef struct CircularBuffer {
 
 } CircularBuffer;
 
-typedef struct Lgm_MagModelInfo {
+typedef struct Lgm_MagModelInfo Lgm_MagModelInfo;
+
+struct Lgm_MagModelInfo {
 
     Lgm_CTrans  *c;                 /* This contains all time info and a bunch more stuff */
     long int	nFunc;
-    int 		(*Bfield)();
+    int 		(*Bfield)(Lgm_Vector*, Lgm_Vector*, Lgm_MagModelInfo*);
     int			SavePoints;
     double		Hmax;
     FILE	    *fp;
@@ -566,7 +568,7 @@ typedef struct Lgm_MagModelInfo {
     void        *Data;
 
 
-} Lgm_MagModelInfo;
+} ;
 void Lgm_GSM_TO_PQB( Lgm_Vector *u_gsm, Lgm_Vector *u_pqb, Lgm_MagModelInfo *m );
 void Lgm_Set_GSM_TO_PQB( Lgm_Vector *Position, Lgm_MagModelInfo *m );
 void Lgm_PQB_TO_GSM( Lgm_Vector *u_pqb, Lgm_Vector *u_gsm, Lgm_MagModelInfo *m );
diff --git a/libLanlGeoMag/Lgm_B_FromScatteredData.c b/libLanlGeoMag/Lgm_B_FromScatteredData.c
index 5617957d..228b1ee4 100644
--- a/libLanlGeoMag/Lgm_B_FromScatteredData.c
+++ b/libLanlGeoMag/Lgm_B_FromScatteredData.c
@@ -500,7 +500,7 @@ int Lgm_B_FromScatteredData3( Lgm_Vector *v, Lgm_Vector *B, Lgm_MagModelInfo *In
     unsigned long int  *I_data;
     unsigned long int  *LookUpKey;                // key comprised of an array of unsigned long int Id's
     int                 KeyLength;                // length (in bytes) of LookUpKey
-    int                 (*Dipole)();         // tmp Pointer to Bfield function
+    int                 (*Dipole)(Lgm_Vector*, Lgm_Vector*, Lgm_MagModelInfo*);         // tmp Pointer to Bfield function
 
 
     /*
@@ -899,7 +899,7 @@ int Lgm_B_FromScatteredData4( Lgm_Vector *v, Lgm_Vector *B, Lgm_MagModelInfo *In
     unsigned long int  *I_data;
     unsigned long int  *LookUpKey;                // key comprised of an array of unsigned long int Id's
     int                 KeyLength;                // length (in bytes) of LookUpKey
-    int                 (*Dipole)();         // tmp Pointer to Bfield function
+    int                 (*Dipole)(Lgm_Vector*, Lgm_Vector*, Lgm_MagModelInfo*);         // tmp Pointer to Bfield function
 
 
     /*
@@ -1305,7 +1305,7 @@ int Lgm_B_FromScatteredData5( Lgm_Vector *v, Lgm_Vector *B, Lgm_MagModelInfo *In
     unsigned long int  *I_data;
     unsigned long int  *LookUpKey;                // key comprised of an array of unsigned long int Id's
     int                 KeyLength;                // length (in bytes) of LookUpKey
-    int                 (*Dipole)();              // tmp Pointer to Bfield function
+    int                 (*Dipole)(Lgm_Vector*, Lgm_Vector*, Lgm_MagModelInfo*);              // tmp Pointer to Bfield function
 
 
 //if (Info->KdTree_kNN_MaxDist2 < 1e8) printf("AHA Info->KdTree_kNN_MaxDist2 = %g\n", Info->KdTree_kNN_MaxDist2 );
@@ -2229,7 +2229,7 @@ int Lgm_B_FromScatteredData6( Lgm_Vector *v, Lgm_Vector *B, Lgm_MagModelInfo *In
     unsigned long int  *I_data;
     unsigned long int  *LookUpKey;                // key comprised of an array of unsigned long int Id's
     int                 KeyLength;                // length (in bytes) of LookUpKey
-    int                 (*Dipole)();         // tmp Pointer to Bfield function
+    int                 (*Dipole)(Lgm_Vector*, Lgm_Vector*, Lgm_MagModelInfo*);         // tmp Pointer to Bfield function
 
 
     /*