Complex asteroseismology of the B-type main sequence pulsators

We present examples of an extended asteroseismic modelling in which we aim at fitting not only pulsational frequencies but also certain complex parameter related to each frequency. This kind of studies, called \textbf{complex asteroseismology}, has been successfully applied to a few main sequence B-type pulsators and provided, in particular, plausible constraints on \textbf{stellar opacities}. Here, we briefly describe our results for three early B-type stars.