  An analytical result for the renormalization of the jump of the heat capacity
Delta C/C_N by the anisotropy of the order parameter is derived within the
framework of the very recent model proposed by Posazhennikova, Dahm and Maki
[cond-mat/0204272, submitted to Europhys. Lett.], for both oblate and prolate
anisotropy. The graph of Delta C/C_N versus the ratio of the gaps on the
equator and the pole of the Fermi surface, Delta_e/\Delta_p, allows a direct
determination of the gap anisotropy parameter Delta_e/\Delta_p by fitting data
from specific heat measurements Delta C/C_N. Using the experimental value Delta
C/C_N=0.82 +/- 10% by Wang, Plackowski, and Junod [Physica C 355 (2001) 179] we
find Delta_e/\Delta_p = 4.0.
