Left: the damping time of the standing slow, τ_slow (blue), and entropy, τ_entropy (red), modes, obtained from a numerical solution of Equation (5) as a function of temperature for a loop of length L = 180 Mm and plasma density ρ₀ = 3 × 10⁻¹² kg m⁻³. Right: ratio τ_entropy/τ_slow from Equation (5) as a function of loop temperature and density (for the same loop length). Contours of τ_entropy/τ_slow = 0.3 and 0.1 are shown as red dotted and solid lines, respectively.