Spectral lags for the 70 GRBs in our sample. Upper panel: lags between Band 1 and Band 2 (τ₁₂, blue points), Band 3 (τ₁₃, green points) and Band 4 (τ₁₄, orange points) and their 1σ uncertainties (listed in Table A.1). Short GRBs are marked with star symbols and their names are in red color. Spectral lags τ values are represented in symmetric-logarithmic scale for visualization purposes. Lower panel: distributions of spectral lag values.