[OI] luminosity at 63.18 μm versus flaring index (γ) for a model star with L_∗ = 0.13  L_⊙, R_in = R_sub, R_out = 100 AU, a_min = 0.05  μm, a_min = 1000  μm, ϵ = −1.0, f_UV = 0.1 and M_dust = M_gas = 10^-6  M_⊙ at the distance of TWA 03A. The model is for illustration, and is not intended to represent TWA 03A exactly, but a generic system with similar stellar parameters. The horizontal, dashed line represents the average upper limit for objects in TWA.