  In the present work we provide the preliminary results obtained when
analysing the rotational Petersen diagrams when including the effects of near
degeneracy. We found that near degeneracy affects significantly the
fundamental-to-first overtone period ratios, showing wriggles in the Petersen
diagrams. Analysis of such wriggles reveals that they are mainly caused by the
avoided-crossing phenomenon. The size of wriggles seems to increase with the
rotational velocity and could, in certain cases, invalidate any accurate mass
and/or metallicity determinations. Nevertheless, deep analysis of near
degeneracy effects may allow us to obtain additional information on the mode
identification of the radial modes and their corresponding coupled pairs, which
would allow us to constrain the modelling.
