2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99559A simple theoretical model describing the positive sign of subnatural-width absorption resonances in the recent experiment of Akulshin and co-workers (Phys. Rev. A, {\bf 57}, 2996 (1998)) is proposed. An analytical expression for the linear response to the weak probe field is found in the low-saturation limit with respect to the control field. It is shown that the positive sign of subnatural resonance is caused by the spontaneous transfer of the light-induced coherence from the excited level to the ground one.RevTeX 4 pages, 3 ps figuresAtomic PhysicsQuantum Physicstext