Integrated spectrum over the region within ±1″ of the core from 85.886 to 89.946 GHz, after subtracting continuum emission. The frequency resolution is 20 MHz, and the rms noise is 0.28 mJy. (a) Spectrum as functions of topocentric frequency in GHz. The vertical dashed lines represent V_sys for each molecular line. (b) Spectra of HCN J = 1–0 and HCO⁺J = 1–0 emission lines as functions of velocity with respect to V_sys.