std::cout << "GetZSpacing() of sorted SingleSerieUIDFileSet "
<< "from GDCM_NAME_SPACE::SerieHelper: " << zspacing << std::endl;
std::cout << " ('-1' means all the files have the same position)" << std::endl;
std::cout << "GetZSpacing() of sorted SingleSerieUIDFileSet "
<< "from GDCM_NAME_SPACE::SerieHelper: " << zspacing << std::endl;
std::cout << " ('-1' means all the files have the same position)" << std::endl;