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diff --git a/graphics/epix/doc/my_code.cc b/graphics/epix/doc/my_code.cc
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+/* my_code.cc */
+#include "my_code.h"
+using namespace ePiX;
+
+namespace Mine {
+ double lorentz_norm(P arg)
+ {
+ double x=arg.x1(), y=arg.x2(), z=arg.x3(); // extract coords
+ return -x*x + y*y + z*z;
+ }
+ bool spacelike(P arg)
+ {
+ return (lorentz_norm(arg) > 0);
+ }
+} // end of namespace