Update of the e^+e^-topi^+pi^- cross section measured by SND detector in the energy region 400<sqrt{s}<1000 MeV

The corrected cross section of the e^+e^-topi^+pi^- process measured in the SND experiment at the VEPP-2M e^+e^- collider is presented. The update is necessary due to a flaw in the e^+e^-topi^+pi^- and e^+e^-tomu^+mu^- Monte Carlo events generators used previously in data analysis.