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diff --git a/src/basis.h b/src/basis.h
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+/*
+ * basis.h
+ *
+ * Find approximate lattices to feed various procedures
+ *
+ * (c) 2007 Thomas White <taw27@cam.ac.uk>
+ *
+ *  dtr - Diffraction Tomography Reconstruction
+ *
+ */
+ 
+#ifndef BASIS_H
+#define BASIS_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "control.h"
+
+typedef struct {
+	
+	double x;
+	double y;
+	double z;
+	
+} Vector;
+
+typedef struct basis_struct {
+	Vector a;
+	Vector b;
+	Vector c;
+} Basis;
+
+extern Basis *basis_find(ControlContext *ctx);
+
+#endif	/* BASIS_H */
+