LOS decomposition of starlight polarization by TRIShUL displayed in (q, u) − μ (q in green, u in blue) plane for the polarization data from Panopoulou et al. (2019). The vertical lines indicate the positions of the cloud layers estimated by our method, with the shaded regions representing statistical (pink) and systematic (gray) uncertainties. Top panel: one-cloud region. Bottom panel: two-cloud region. The estimated distance range from Panopoulou et al. (2019) and Pelgrims et al. (2023) are marked in orange and black as GP19 and VP23, respectively.