Gas-dust correlation plot of the brightest velocity component (“a” in the spectrum shown in Fig. 3) of the filament candidate G333.297+00.073. The blue line gives the one-to-one correlation. The green area indicates values above the σ_gas limit (p_gas = 0.51). The red line shows the fitting result, and the area within the dashed red lines marks the ± σ_cor surrounding (p_cor = 0.80). p_{cor, gas} = 0.70 is estimated from the overlap of these areas.