Emission line profiles toward AH Sco (blue) and VX Sgr (red) in the vicinity of the υ = 0, J = 6–5 transition of ³⁰SiO (at 254.217 GHz) and of the (0,1,1) 7₃,₄–(l, 1,0) 6₅,₁ transition of para water near 254.235 GHz (line 9, Table 2). The spectra are extracted from the high resolution data for a circular aperture of 0.″2 diameter and plotted in the rest frequency frame. The dotted black vertical line is the expected water frequency according to Furtenbacher et al. (2020) (see Table 2). Identification of the water transition at 254.235 GHz is uncertain (see discussion in Appendix C).