Scatter plots of the relation between T and B². Left panel: for the inner FPs of the large sample. Right panel: For a square covering the whole sunspot and some QS regions in all six time steps. The red lines are straight line fits to all or subsets of data points. The inset in the upper right corner of the right panel shows the corresponding spatial mask for the umbra (purple), penumbra (orange), and QS (red) at 14:48 UT.