boost::split(tmp, parameters[1], boost::is_any_of(","));
if(tmp.size() != this->levels_) {
surf_parse_error("Fat trees are defined by the levels number and 3 vectors"
boost::split(tmp, parameters[1], boost::is_any_of(","));
if(tmp.size() != this->levels_) {
surf_parse_error("Fat trees are defined by the levels number and 3 vectors"