Upper panels: Hβ and Hα line profiles of one of the slow rotating Be stars, N206-FS 117. Lower panel: v sin i from the profile fitting of the Si III absorption line using the iacob-broad tool. The gray curves show the observed line profile. The v sin i is calculatedfrom line profile fitting based on the Fourier transform method (red dotted line) and goodness-of-fit analysis (violet dashed line).