Time evolution of the physical properties of the RoI marked with a red box in Fig. 1. Left panels: Intensity variation over time (from top to bottom) at the 4000 Å continuum, and in the line cores of Ca II 8542 Å and Ca II K. Middle and right panels: Time evolution of the temperature and v_LOS at a photospheric depth (log(τ_500 nm) = 0.1) and two different chromospheric depths, log(τ_500 nm) = −3.9 and −4.6. Three cuts across the head, middle, and the tail of this fibril are marked and numbered and their properties as a function of time are displayed in Fig. 4.