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diff --git a/algo/blast/composition_adjustment/matrix_frequency_data.h b/algo/blast/composition_adjustment/matrix_frequency_data.h
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+/* $Id: matrix_frequency_data.h,v 1.1 2005/12/01 13:52:20 gertz Exp $
+ * ===========================================================================
+ *
+ *                            PUBLIC DOMAIN NOTICE
+ *               National Center for Biotechnology Information
+ *
+ *  This software/database is a "United States Government Work" under the
+ *  terms of the United States Copyright Act.  It was written as part of
+ *  the author's official duties as a United States Government employee and
+ *  thus cannot be copyrighted.  This software/database is freely available
+ *  to the public for use. The National Library of Medicine and the U.S.
+ *  Government have not placed any restriction on its use or reproduction.
+ *
+ *  Although all reasonable efforts have been taken to ensure the accuracy
+ *  and reliability of the software and data, the NLM and the U.S.
+ *  Government do not and cannot warrant the performance or results that
+ *  may be obtained by using this software or data. The NLM and the U.S.
+ *  Government disclaim all warranties, express or implied, including
+ *  warranties of performance, merchantability or fitness for any particular
+ *  purpose.
+ *
+ *  Please cite the author in any work or product based on this material.
+ *
+ * ===========================================================================*/
+/**
+ * @file joint_probs.h
+ * @author Alejandro Schaffer, E. Michael Gertz
+ *
+ * Definitions used to get joint probabilities for a scoring matrix
+ */
+#ifndef __BLAST_JOINT_PROBS__
+#define __BLAST_JOINT_PROBS__
+
+#include <algo/blast/core/blast_export.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+NCBI_XBLAST_EXPORT
+int Blast_GetJointProbsForMatrix(double ** probs, double row_sums[],
+                                 double col_sums[], const char *matrixName);
+
+NCBI_XBLAST_EXPORT
+const double * Blast_GetMatrixBackgroundFreq(const char *matrix_name);
+
+NCBI_XBLAST_EXPORT
+int Blast_FrequencyDataIsAvailable(const char *matrix_name);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif