A.Dainese presented his work on a Kalman track parametrization in TPC. N.DiBari asked if the difference in the covariance matrix for pions and kaons was important for the charm studies. No, because it affects only the low momenta. K.Safarik asked about the efficiency checks. There was a difference around dead regions in the TPC, which were passive in the simulation and no first hit was available. K.Safarik noted that one could play with the vertex constraint due to the presence of bremsstrahlung.