After a collimation of the C11 telescope i could now better spectra of 28Tau and later of zeta Tauri. used spectrograph: L200 with 1800 l/mm grating and Trius SX814 CCD camera in 2×2 binning on 13 febr. 2018. link to the data can you find via links below:  28 Tau and zeta Tauri