  We argue that recently proposed [Melnyk et al., Fluid Phase Equilibr., 2009,
Vol. 279, 1] a criterion to split the pair interaction energy into two parts,
one of which is forced to be responsible the most accurate as possible for
excluded volume energy in the system, results in expressions for the virial
coefficients that improve the performance of the virial equation of state in
general, and at subcritical temperatures, in particular. As an example,
application to the Lennard-Jones-like hard-core attractive Yukawa fluid is
discussed.
