Tracing molecular stratification within an edge-on protoplanetary disk

High-resolution observations of edge-on proto-planetary disks in emission from molecular species sampling different critical densities and formation pathways offer the opportunity to trace vertical chemical physical structures protoplanetary disks. Based on analysis sub-arcsecond resolution Atacama Large Millimeter Array (ALMA) archival data for Flying Saucer disk (2MASS J16281370-2431391), we establish radial differentiation CN emitting regions with respect those $^{12}$CO CS, model conditions which arises. We demonstrate that (2-1), CS J=5-4 decrease scale height above midplane, such 12CO, CN, layers increasing density decreasing temperature. find at radii > 100 au central star, arises predominantly intermediate layers, while inner region disk, appears arise closer midplane. investigate within regions, as well ranges excitation temperature column density, via RADEX non-LTE modeling three brightest hyperfine lines. Near where derive nH2 ~10$^{7}$ cm$^{-3}$ relatively low T$_{kin}$ (~12 K), is thermalized, sub-thermal, appear obtain higher (intermediate) layers. consider whether how particular spatial location can be related production governed, radially vertically, by degree irradiation flared X-rays UV photons star.