The vector magnetic field from HMI and BBSO respectively. Panel a: Vector magnetogram of the FOV obtained from SDO/HMI. The vertical component of the vector magnetic field Bz in grayscale is overlaid with arrows. The red and blue arrows represent the strength and direction of positive and negative transverse fields, respectively. The purple contour indicates the boundary where the longitudinal field value is 0. The area is an important location for magnetic reconnection. Panel b: Vector magnetogram of the FOV obtained from BBSO/NIRIS after removing the 180° ambiguity in the transverse field. The vertical component of vector magnetic field, B_z, in grayscale is overlaid with arrows. The red and blue arrows represent the strength and direction of positive and negative transverse fields, respectively. The purple contour also indicates the boundary where the longitudinal field value is 0.