As a proof of concept for a variable v sini parameter, the differences in the FEROS 1999 and the FEROS 2006 to the FEROS 2000 spectrum are shown. Below is the modeled spectrum (scaled by a factor of 1/15), calculated with a fixed T_eff = 15   000 K, β = 0.25,v sini = 250 km s^-1. The model differences of Δv sini =  + 35 km s^-1 and Δv sini =  + 10 km s^-1 are shown between the observed ones.