(*out) << " _head_yc " << _head_yc << endl;
(*out) << " _head_radius " << _head_radius << endl;
(*out) << " _head_tilt " << _head_tilt << endl;
(*out) << " _head_yc " << _head_yc << endl;
(*out) << " _head_radius " << _head_radius << endl;
(*out) << " _head_tilt " << _head_tilt << endl;