Fix feature printed message

src/feature/feature_base.cpp

@@ -198,7 +198,7 @@ void FeatureBase::link(CaptureBasePtr _cpt_ptr)
 }
 void FeatureBase::printHeader(int _depth, bool _constr_by, bool _metric, bool _state_blocks, std::ostream& _stream, std::string _tabs) const
 {
-    _stream << _tabs << "Ftr" << id() << " trk" << trackId() << " " << getType() << ((_depth < 4) ? " -- " + std::to_string(getFactorList().size()) + "c  " : "");
+    _stream << _tabs << "Ftr" << id() << " trk" << trackId() << " " << getType() << ((_depth < 4) ? " -- " + std::to_string(getFactorList().size()) + "fac  " : "");
     if (_constr_by)
     {
         _stream << "  <--\t";