A log plot of the integrated line intensities in Jy km s^-1 versus several disk parameters that probe the total dust mass (F_1.3mm), dust settling via the mid-infrared spectral slope (Δn), amount of small grains via the 10 μm silicate emission feature strength (Si-strength), and the total gas mass (inferred from the ¹³CO line flux). Blue squares represent our JCMT observations, red circles represent data from the literature, and black arrows are used to indicate all upper limits. A green star symbol represents T Tau, whose line emission is contaminated by a large remnant envelope in the single-dish data plotted. The upper-right panel illustrates the dynamic range of the available gas reservoirs. (Color plots are available online.)