Comparison between the gas phase molecular line luminosities and 13–25 μm spectral indices measured in the XUE 10 (yellow star) and the rest of the XUE sample (orange stars; Ramírez-Tannus et al. 2025), GW Lup (Grant et al. 2023), and the Spitzer sample analyzed in Banzatti et al. (2020); Banzatti et al. (2022) (blue and gray markers), labeled with an asterisk. The y-axis displays the H₂O luminosity; from left to right, the x-axis displays the ¹²CO₂ and CO luminosities, plus the estimated 13–25 μm spectral index. The upper limits are indicated with arrows, and the open circles show the sources detected with upper limits in both the x- and y-axes. The shaded region in the right-most panel flags where n_13–25> 1.1, indicative of a dust-depleted inner disk.