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diff --git a/src/math/covariance-matrix.h b/src/math/covariance-matrix.h
deleted file mode 100644
index c16e5cbc..00000000
--- a/src/math/covariance-matrix.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/* PSPP - a program for statistical analysis.
-   Copyright (C) 2008 Free Software Foundation, Inc.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
-
-/*
-  Create covariance matrices for procedures that need them.
- */
-
-#ifndef COVARIANCE_MATRIX_H
-#define COVARIANCE_MATRIX_H
-
-#include <math/design-matrix.h>
-#include <math/interaction.h>
-
-struct moments1;
-struct ccase;
-struct hsh_table;
-struct covariance_matrix;
-enum
-{ ONE_PASS,
-  TWO_PASS
-};
-
-/*
-  How to deal with missing values.
- */
-enum
-{ LISTWISE,
-  PAIRWISE
-};
-struct design_matrix *covariance_matrix_create (size_t, const struct variable *[]);
-
-void covariance_matrix_destroy (struct covariance_matrix *);
-void covariance_pass_two (struct design_matrix *, double,
-			  double, double, const struct variable *,
-			  const struct variable *, const union value *,
-			  const union value *);
-void covariance_matrix_compute (struct covariance_matrix *);
-struct covariance_matrix *covariance_matrix_init (size_t,
-						  const struct variable *[],
-						  int, int, enum mv_class);
-void covariance_matrix_free (struct covariance_matrix *);
-void covariance_matrix_accumulate (struct covariance_matrix *,
-				   const struct ccase *, void **, size_t);
-struct design_matrix *covariance_to_design (const struct covariance_matrix *);
-double covariance_matrix_get_element (const struct covariance_matrix *, size_t, size_t);
-void covariance_interaction_set (struct covariance_matrix *, 
-				 const struct interaction_variable **, size_t);
-#endif