Space-time diagrams for selected nanoflares and associated bright loops in the mm continuum. Panels a and c: space-time plots along the dotted lines in panels b and d which in turn show ALMA T_b maps at two instances of time marked by the vertical dotted lines in the corresponding panels a and c. The contours correspond to 9, 10, 12 kK (solid, dot-dashed, dashed). The inset in panel c shows a space-time plot for the green path in panel d. The space-time panels are saturated at 10 kK. The dashed lines correspond to projected velocities of 37 km s⁻¹ and 104 km s⁻¹ in the first event, and ∼340 km s⁻¹ in the second event.