1 files changed, 3 insertions, 0 deletions
diff --git a/crystal.h b/crystal.h
index 5c38da8..21dc5c8 100644
--- a/crystal.h
+++ b/crystal.h
@@ -29,5 +29,8 @@ typedef struct
 
 /* Return what the measurement 'val' would have been if the cell were 'cell' */
 extern double crystal_calc(MVal val, Cell cell);
+extern double dspacing(Cell cell, double h, double k, double l);
+extern double plane_angle(Cell cell, double h1, double k1, double l1,
+				   double h2, double k2, double l2);
 
 #endif	/* CRYSTAL_H */