  By means of electronic transport, we study the transverse magnetic anisotropy
of an individual Fe$_4$ single-molecule magnet (SMM) embedded in a
three-terminal junction. In particular, we determine in situ the transverse
anisotropy of the molecule from the pronounced intensity modulations of the
linear conductance, which are observed as a function of applied magnetic field.
The proposed technique works at temperatures exceeding the energy scale of the
tunnel splittings of the SMM. We deduce that the transverse anisotropy for a
single Fe$_4$ molecule captured in a junction is substantially larger than the
bulk value.
