Comparison between effective temperatures obtained from the UV versus optical for all our sample. The stars are ordered from the later to the earlier types. The effective temperature derived from the UV and the optical regions are shown, respectively, by circles (blue) and crosses (red). We show weighted least squares fits to the UV T_eff (dashed blueline) and to the optical T_eff (dashed red line). We note the good agreement between them and the trend of higher T_eff towards earlier spectral types.