Run D (three-layer open model, weak turbulence case): spatial distributions of fluctuations (top and mid panels) and turbulent heating (bottom panel). The time-averaged rms amplitude (in km s^-1) are plotted as a function of loop coordinate (in Mm) for z⁺,   z⁻ (top panel, solid and dashed lines, respectively) and for b/ (bottom panel, solid and dashed lines, respectively). The time-averaged heating rate (in arbitrary units) is plotted in the bottom panel as a solid line, and a snapshot is shown in dotted line.