Solenoidal turbulence fraction for sliding square areas with a width equal to the one of the full map (56 arcmin). The shaded area corresponds to the g₂₁ uncertainty, while the error bars show the experimental uncertainties due to observational noise. The vertical line marks the equipartition limit. The map on the left presents the centres of the square areas for which the calculations were performed, superimposed on the ¹³CO(J = 1−0) T_peak map.