Simulation calculation of the performance of BESIII main drift chamber

According to the scheme in design of main drift chamber (MDC) on BESIII, the error matrix of five parameters are calculated with TRACKERR. The five parameters are ζ (the displacement in Z), s (is the tangent of the dip angle, the dip angle is λ =π/2-θ), ξ(is the displacement in the x-y plane perpendicular to the projection of the track direction vector onto that plane), φ(is the azimuth of the particle's direction), and Κ(the inverse of the radius of curvature). At the same time, the responding momentum resolution and space resolution of charged track in GeV/c are given