Left: Joule heating per unit mass along the length of the coronal loop L1 plotted every 100 s. The x axis corresponds to the position along the loop measured from left to right footpoint. The profiles have been smoothed with a boxcar average with kernel length of 0.5 Mm for clarity. Right: evolution of the heating asymmetry quantified as the ratio of the maximum heating in the loop legs to minimum heating at the loop apex H_max/H_min (blue) and left-to-right asymmetry in heating of the loop legs H_left/H_right (red) for the loop L1. The red dashed line indicates where H_left/H_right = 1, i.e. the line corresponding to perfectly symmetric heating for reference.