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-rw-r--r--src/phi0.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/phi0.h b/src/phi0.h
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+++ b/src/phi0.h
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+// phi0.h
+#ifndef PHI0_H
+#define PHI0_H
+
+extern float phi0(float xf);
+
+#endif