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diff --git a/2.3-1/src/c/signalProcessing/includes/zpch1.h b/2.3-1/src/c/signalProcessing/includes/zpch1.h
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+++ b/2.3-1/src/c/signalProcessing/includes/zpch1.h
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+/* Copyright (C) 2016 - IIT Bombay - FOSSEE
+
+ This file must be used under the terms of the CeCILL.
+ This source file is licensed as described in the file COPYING, which
+ you should have received as part of this distribution.  The terms
+ are also available at
+ http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ Author: Ankit Raj
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+ */
+
+#ifndef __ZPCH1_H__
+#define __ZPCH1_H__
+#include "types.h"
+#include "doubleComplex.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+double dzpch1s(double N,double e,double wc,doubleComplex* out);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* __ZPCH1_H__ */