  The possibility of disappearance of the diffuse-intensity peak splitting
induced by the Fermi surface (i.e., of coalescence of the intensity maxima)
with decreasing temperature is predicted. The underlying mechanism is the
compensation of the reciprocal-space curvatures of the self-energy and the
interaction. The theory also describes similar results obtained earlier for two
low-dimensional models with competing interactions. The coalescence is compared
with the recently observed "thermal" splitting in Pt-V which can be explained
in the same way.
