Polarization percentage as a function of the intensity normalized to the peak emission I∕I_max for Hub-N (upper panel) and Hub-S (lower panel), computed pixel by pixel. Red and Yellow circles show data > 3σ_P whereas blueand green stars show data between 2 and 3σ_P for Hub-N and Hub-S. Red and yellow dotted lines and blue and green dashed lines show the power laws that best fit the data above 3σ_P and the combined data, respectively (see Table 1). A lower intensity threshold of 3σ (σ = 0.08 Jy beam⁻¹) has been considered.