  First version: del Barco et al. submitted recently a comment
[arXiv:0812.4070] on our latest Phys. Rev. Lett. [Phys. Rev. Lett. 101, 237204
(2008)], claiming three basic mistakes. We show here that their claims are
unjustified and based on erroneous calculations and hasty conclusions. Second
version: reply to the modified version of del Barco et al. submitted to Phys.
Rev. Lett.
