dx = rnd->Gaus(0.,sigmatr);
dy = rnd->Gaus(0.,sigmatr);
dz = rnd->Gaus(0.,sigmatr);
dpsi = rnd->Gaus(0.,sigmarot);
dtheta = rnd->Gaus(0.,sigmarot);
dphi = rnd->Gaus(0.,sigmarot);
dx = rnd->Gaus(0.,sigmatr);
dy = rnd->Gaus(0.,sigmatr);
dz = rnd->Gaus(0.,sigmatr);
dpsi = rnd->Gaus(0.,sigmarot);
dtheta = rnd->Gaus(0.,sigmarot);
dphi = rnd->Gaus(0.,sigmarot);