  The most accurate way to get information on the mass of the MACHOs (Massive
Astrophysical Compact Halo Objects) is to use the method of mass moments. For
the microlensing events detected so far by the EROS and the MACHO
collaborations in the Large Magellanic Cloud the average mass turns out to be
0.08$M_{\odot}$. Assuming a spherical standard halo model we find that MACHOs
contribute about 20\% to the halo dark matter. The eleven events recorded by
OGLE, mainly during its first two years of operation, in the galactic bulge
lead to an average mass of 0.29$M_{\odot}$, whereas forty events detected by
MACHO during its first year give 0.16$M_{\odot}$, thus suggesting that the lens
objects are faint disk stars.
