Logarithm of the mass accretion rate vs inner hole size for our sample. Different symbols are used to distinguish the methods used in the literature to derive the size of the inner hole. Blue squares are adopted when this has been derived using IR-SED fitting, red circles show that the values are derived from resolved mm-interferometry observations. Downward arrows are upper limits. The two lowest points are, from left to right, CHXR22E and Ser29. The object at R_in = 25 AU and log Ṁ_acc = −9.8 is Ser 34.