  A realistic assessment of the uncertainties in the even zonals of a given
geopotential model must be made by directly comparing its coefficients with
those of a wholly independent solution of superior formal accuracy. Otherwise,
a favorable selective bias is introduced in the evaluation of the total error
budget of the LAGEOS-based Lense-Thirring tests yielding likely too optimistic
figures for it. By applying a novel approach which recently appeared in the
literature, the second (L = 4) and the third (L = 6) even zonals turn out to be
uncertain at a 2-3 10^-11 (L = 4) and 3-4 10^-11 (L = 6) level, respectively,
yielding a total gravitational error of about 27-28%, with an upper bound of
37-39%. The results by Ries et al. themselves yield an upper bound for it of
about 33%. The low-degree even zonals are not exclusively determined from the
GRACE Satellite-to-Satellite Tracking (SST) range since they affect it with
long-period, secular-like signatures over orbital arcs longer than one orbital
period: GRACE SST is not accurately sensitive to such signals. Conversely,
general relativity affects it with short-period effects as well. Thus, the
issue of the a priori "imprinting" of general relativity itself in the
GRACE-based models used so far remains open.
