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diff --git a/silx/math/fit/filters_wrapper.pxd b/silx/math/fit/filters_wrapper.pxd
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+# coding: utf-8
+#/*##########################################################################
+# Copyright (C) 2016 European Synchrotron Radiation Facility
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+#############################################################################*/
+
+__authors__ = ["P. Knobel"]
+__license__ = "MIT"
+__date__ = "22/06/2016"
+
+cimport cython
+
+cdef extern from "filters.h":
+    void snip1d(double *data,
+                int size,
+                int width)
+
+    void snip2d(double *data,
+                int nrows,
+                int ncolumns,
+                int width)
+
+    void snip3d(double *data,
+                int nx,
+                int ny,
+                int nz,
+                int width)
+
+    int strip(double* input,
+              long len_input,
+              double c,
+              long niter,
+              int deltai,
+              long* anchors,
+              long len_anchors,
+              double* output)
+
+    int SavitskyGolay(double* input,
+                      long len_input,
+                      int npoints,
+                      double* output)
+
+    void smooth1d(double *data,
+                  int size)
+
+    void smooth2d(double *data,
+                  int size0,
+                  int size1)
+
+    void smooth3d(double *data,
+                  int size0,
+                  int size1,
+                  int size2)