Flux densities (F_ν) of the selected, isolated Class II disks in the Ophiuchus region. The vertical error bars are ±1σ uncertainties (δF_ν). Solid lines show the power laws that are the best fits to the data taken from this work (Section 2); shaded areas outline the ±1σ fitting uncertainties. We compared with the observations published in S. M. Andrews & J. P. Williams (2007), S. M. Andrews et al. (2008, 2009, 2010), E. G. Cox et al. (2017), A. Tripathi et al. (2017), S. M. Andrews et al. (2018b), J. P. Williams et al. (2019), A. Garufi et al. (2020), L. Testi et al. (2022), A. Michel et al. (2023), A. Dasgupta et al. (2025), and A. Shoshi et al. (2025). S. M. Andrews et al. (2008) reported the flux density of DoAr 25, which is identical to the value that can be quoted from S. M. Andrews et al. (2009). Therefore, we omit the label of this record in the figure legend.