Boundary relations for A > 1000 px activity clusters. Left column: Median AIA 1600 intensity as a function of B_LOS binned in steps of ΔB_Vec = 10 G. Right column: Median B_LOS intensity as a function of AIA 1600 binned in steps of ΔI_AIA = 0.05. The first row shows the median relations for the 1-boundary (blue) and the 2-boundary (orange), the second for the 3-boundary and the 4-boundary, and the third for the 5-boundary and the 6-boundary. Black lines show the median relations calculated from all activity cluster pixels. Error bars show twice the bootstrap standard error. The bins that have fewer than 100 data points are omitted.