Some comments on the recent results about the measurement of the   Lense-Thirring effect in the gravitational field of the Earth with the LAGEOS   and LAGEOS II satellites
  With quantitative numerical simulations we show that the secular variations of the even zonal harmonics of the geopotential do affect the measurement of the Lense-Thirring effect with the nodes of LAGEOS and LAGEOS II at a \sim 14% level. Thus, the 1-sigma total error in the performed test with the 2nd generation CHAMP-only EIGEN2 Earth gravity model amounts to 51%, contrary to 18% claimed by Ciufolini. 
Lorenzo Iorio