The “perfect” IEF channel south of the sunspot. Left column: 3D view of the MFLs connecting the sunspot to the opposite-polarity patch on top of the continuum intensity I_c (top panel), B_z (middle panel), and the Ca II IR LOS velocity (bottom panel). Right column: different quantities averaged over the MFLs in the left column as a function of the relative length L. Top panel: temperature (blue line, y-axis at the left) and height (red line, y-axis at the right). Middle panel: LOS magnetic flux Φ_LOS (green line), B_z (blue line) and field strength B (red line). Bottom panel: LOS velocities of HMI (green line), Ca II IR (blue line), and Hα (red line).