Top: relation between the total luminosity of the Lyα envelope and that of the quasar in the broad Lyα line. Our measurements (red squares) are compared with CJW (black circles). The open squares represent the direct measurements, while the filled dots are those corrected for slit clipping (see text). The downward arrows show our upper limits for SDSS J0939 + 0039 and Q 2139−4324, where no Lyα  envelope is seen. In computing this limit, we assumed a radius r = 23 kpc (i.e., the mean size of the other four objects) and we did not correct for slit-clipping. The black solid line was least squares fitted to the objects of CJW and to our detected envelopes (with correction for slit clipping), except for BR 2237−0607. The blue triangles relate the Lyα luminosity (corrected for slit clipping) with the luminosity of the ionizing radiation from the UV continuum of the quasar (λ < 912 Å, see Sect. 3.3). The arrows again show the upper limits to the luminosity of the undetected envelopes. Bottom: the radius of the envelope as a function of L(BLR). Note the tight trend followed by the envelopes of the bright RQQs of CJW. Note also that BR 1033 − 0327  stands above the maximum size of the RQQs of CJW, likely owing to our deeper flux limit.