  Time and angular resolved photoelectron spectroscopy is a powerful technique
to measure electron dynamics in solids. Recent advances in this technique have
facilitated band and energy resolved observations of the effect that excited
phonons, have on the electronic structure. Here, we show with the help of
\textit{ab initio} simulations that the Fourier analysis of time-resolved
measurements of solids with excited phonon modes leads, in fact, to an
observation of the band- and mode-resolved electron-phonon coupling directly
from the experimental data and without need for theoretical computations.
