Owing to the e(τ) → g IC, two GSB contributions arise: the cold and the hot. The cold contribution is the conventional GSB signal which reveals the nuclear wavepacket on the electronic ground state. It is described by the window function W int 0 of Eq. (33). The hot contribution is the ICinduced GSB signal, that reveals the manifold-I trajectory which jumps to the electronic ground state after the e(τ) → g IC. This trajectory contributes to the GSB with a minus sign, -W int 0 in Eq. ( ) 115 .