Therefore such a question is of very general interest, concerning both previous results and future researches on CP stars. To address this problem it should first be pointed out that for both stars, discrepancies exist between model predictions and observations not only for the Stokes profiles, but also for the magnetic curves. Accordingly, the results of this work do not discourage the use of the magnetic observables for deriving a tentative field model, although it is certainly worthwhile to explore alternative strategies. Further work is in progress, aimed at clarifying which strategy is most appropriate.
Preliminary results confirm the accuracy of such a moment technique .
For the time being, we are left with the problem to evaluate the reliability of the presently available magnetic models of CP stars. Such a feature is so prominent so as to be correctly identified regardless our capability to explain the details of Stokes profiles. However, caution is needed for the interpretation of more detailed modelling results, as it is not clear how closely a model obtained with an insufficient number of free parameters may resemble to the real magnetic configuration. An additional complication that we have not considered is a possible vertical structure of the magnetic field. For CrB and 53 Cam, inspection to Stokes profiles of different lines - probing different layers of the photospheres, do not show evidence for remarkable changes of the magnetic field with optical depth, yet, on the basis of our study, such a complex scenario cannot firmly be rule out.