Magnetic field lines traced from the upflow regions using PFSS extrapolation. Open field lines are in blue, while closed field lines are colored red. (a) A side view of the field lines originated in the AR and ambient coronal holes. (b) Extrapolated field lines from the eastern (purple) and western (green) upflow regions and the ambient coronal hole with SDO/AIA 19.3 nm image. (c) Extrapolated field lines overplotted on the SDO/HMI signed squashing factor Q map. Link to the Jupyter notebook creating this figure: 📘.