Left panel: variation of damping time (τ) with velocity (v) of the oscillation in AIA 171 Å. Right panel: similar to the left but for AIA 193 Å. The black asterisks represent the observed data. A non-linear curve given by the relation τ ∼ a V^b is fitted to the data. Curves with different exponents and constants are overplotted in different colours and line styles. The curve in solid red in the left (right) panel represents the best-fit curve with a and b (in the relation τ ∼ a V^b) of 450 (3657) and −0.7 (−1.3), respectively.