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diff --git a/util.h b/util.h
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+++ b/util.h
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+/*
+ * util.h
+ *
+ * Utility stuff
+ *
+ * (c) 2009 Thomas White <taw27@cam.ac.uk>
+ *
+ * Triclinator - solve nasty triclinic unit cells
+ *
+ */
+
+#ifndef UTIL_H
+#define UTIL_H
+
+typedef struct
+{
+	signed int h1;
+	signed int k1;
+	signed int l1;
+
+	signed int h2;
+	signed int k2;
+	signed int l2;	/* Or zero */
+
+	double meas;
+	double esd;
+} MVal;
+
+extern double read_value(const char *text);
+extern int is_dspacing(MVal val);
+
+#endif	/* UTIL_H */