diff --git a/swig/gridpp.i.bkp b/swig/gridpp.i.bkp
deleted file mode 100644
index 8be183b..0000000
--- a/swig/gridpp.i.bkp
+++ /dev/null
@@ -1,90 +0,0 @@
-%module gridpp
-%init %{
-#if defined(SWIGPYTHON)
-    import_array();
-#endif
-    gridpp::initialize_omp();
-%}
-%include exception.i
-/*
-      SWIG_MemoryError
-      SWIG_IOError
-      SWIG_RuntimeError
-      SWIG_IndexError
-      SWIG_TypeError
-      SWIG_DivisionByZero
-      SWIG_OverflowError
-      SWIG_SyntaxError
-      SWIG_ValueError
-      SWIG_SystemError
-*/
-%exception {
-    try {
-        $action
-    }
-    catch (std::invalid_argument &e) {
-        std::string s(e.what());
-        SWIG_exception(SWIG_ValueError, s.c_str());
-    }
-    catch (gridpp::not_implemented_exception &e) {
-        std::string s(e.what());
-        SWIG_exception(SWIG_RuntimeError, s.c_str());
-    }
-    catch (std::exception &e) {
-        std::string s(e.what());
-        SWIG_exception(SWIG_RuntimeError, s.c_str());
-    }
-    catch (...) {
-        SWIG_exception(SWIG_RuntimeError, "Unknown exception");
-    }
-}
-/* This is needed to make sure that functions returning smart pointers
- * can be accessed properly in python. E.g. calling .corr on a structure function
- * smart pointer
-*/
-%include <std_shared_ptr.i>
-%shared_ptr(gridpp::StructureFunction)
-%shared_ptr(gridpp::MultipleStructure)
-%shared_ptr(gridpp::BarnesStructure)
-%shared_ptr(gridpp::SoarStructure)
-%shared_ptr(gridpp::ToarStructure)
-%shared_ptr(gridpp::PowerlawStructure)
-%shared_ptr(gridpp::LinearStructure)
-%shared_ptr(gridpp::CressmanStructure)
-%shared_ptr(gridpp::CrossValidation)
-
-%include "vector.i"
-%apply std::vector<std::vector<float> >& OUTPUT { std::vector<std::vector<float> >& output };
-%apply std::vector<std::vector<int> >& OUTPUT { std::vector<std::vector<int> >& count };
-%apply std::vector<std::vector<int> >& OUTPUT { std::vector<std::vector<int> >& y_coord };
-%apply std::vector<std::vector<int> >& OUTPUT { std::vector<std::vector<int> >& x_coord };
-%apply std::vector<float>& OUTPUT { std::vector<float>& x_coords };
-%apply std::vector<float>& OUTPUT { std::vector<float>& y_coords };
-%apply std::vector<float>& OUTPUT { std::vector<float>& z_coords };
-%apply float& OUTPUT { float& x_coord };
-%apply float& OUTPUT { float& y_coord };
-%apply float& OUTPUT { float& z_coord };
-%apply std::vector<float>& OUTPUT { std::vector<float>& distances };
-%apply std::vector<float>& OUTPUT { std::vector<float>& standard_error };
-%apply std::vector<float>& OUTPUT { std::vector<float>& analysis_variance };
-%apply std::vector<float>& OUTPUT { std::vector<float>& output_fcst };
-%apply std::vector<std::vector<float> >& OUTPUT { std::vector<std::vector<float> >& analysis_variance };
-%apply std::vector<std::vector<float> >& OUTPUT { std::vector<std::vector<float> >& distances };
-%apply int& OUTPUT { int& X1_out };
-%apply int& OUTPUT { int& Y1_out };
-%apply int& OUTPUT { int& X2_out };
-%apply int& OUTPUT { int& Y2_out };
-%apply std::vector<std::vector<std::vector<float> > >& OUTPUT { std::vector<std::vector<std::vector<float> > >& output };
-// This turns on automatic description of function arguments in the python package. The
-// problem is that it doesn't fetch any of the comments in the header file describing each
-// parameter, so only the type is shown.
-// A different approach is to use -doxygen with swig
-%feature("autodoc", "2");
-
-%{
-#include "gridpp.h"
-%}
-// This is how you add description in the docstring in python. The problem is
-// that the comment is added at the end (after the description of function parameters)
-// %feature("docstring") gridpp::nearest "Nearest neighbour interpolation"
-%include "gridpp.h"