Bolometric magnitude and effective temperature as a function of j, for 2.9 and 3.2 M_⊙ Geneva models ~20 Myr old. Their rotation rate is indicated by the colour scale. The j angles from 0° to 90° are shown with help of dots every 10°. The dot-dashed line represents the zero age MS of non-rotating models from 1.9 M_⊙ to 3.2 M_⊙. Thick black lines show the red and blue borders of the instability strips for non-rotating SPB (this work) and δ Scuti models (Dupret et al. 2005), respectively.