SEDs of the 55 FSRQs in the sample with evidence of optical/UV bump. The meaning of the lines and of data points is the same as in Fig. 1. The 22 FSRQs for which the χ² minimization procedure did not produce valid upper limits are flagged with an asterisk. For these sources upper limits to the torus luminosity were derived as described in the text and are reported in the SEDs. For WMAP7 no. 428, which shows tentative evidence of torus, we report both the best fit torus template and the upper limit such that the model does not exceed the MIR WISE measurements.