Spatial distribution and statistics of the polarised dust emission. Left: comparison between the polarised and total intensity of dust emission. The background image shows the polarised intensity, I_pol, and the white contours show the significant levels of Stokes I (same as Fig. 1). The peak of the polarised dust emission shows a slight offset (~0.2″) from the peak of the total dust emission, potentially due to an increment of the turbulent field and/or tangled magnetic fields along the line of sight. Middle + Right: histogram of measured polarisation fractions (P) and inferred position angles of magnetic fields (χ_B). Individual measurement is sampled from the region with P ≥ 3σ_P with the aperture size that is half the clean beam. The whole region with polarisation detection has a median polarisation fraction of 0.9 ± 0.2% with a variation of 0.4%. It also shows two peaks in the distribution of position angles at χ_B,ı ~28 degrees (diagonal hatched area) and χ_B,2 ~78 degrees (dotted hatched area).