Relation with the distance of the stellar luminosity (top) and the inner dust radius (bottom) for the HAeBes (solid circles and triangles to indicate upper and lower limits), and TTs (open circles) with interferometric estimates of r_in discussed in the text. The gray symbols in the top panel represent most HAeBes known to date from the data in GD21. The regions below the dashed lines indicate apparent bolometric magnitudes >12 and angular radii <0.5 mas.