In orange, inversion results for the t_u indicator and with the full set of modes for 16CygB. In green, inversion results for the same models excluding the modes with the largest error bars in the frequency set. The blue squares are associated with inversion results for which the trade-off parameter θ has been slightly enhanced. In red, blue and magenta, t_u and values in the reference models (See text for the explanation of the colour code).