A_V and T_dust in the B213 cores within our sample are plotted against each other to show the effect of the larger stellar activity in the northern part of B213. In this Figure, the cores in the north of B213 are plotted in different shades of red that go from darker to lighter when moving from north to south. The cores in the central and southern part of B213 are plotted in different shades of blue, with the darkest being the core located more to the south.