Equivalent width measurements for star 654 overplotted on the fit relations described in Eqs. (4) and(5). As mentioned above, we focused on the He lines to determine the spectral type. The blue shaded region indicates the allowed range of spectral types given the measured EWs with corresponding errors. Using this automated method, we determine a spectral type B2 with an accuracy of about one subtype. See also Fig. 10.