Based on the orientation of relativistic beaming of BL Lacertae objects, we show that the observed flux density is enhanced by a factor delta-3+alpha, where delta is the bulk relativistic Doppler factor. Thus, the observed apparent magnitude m(v)ob must be corrected for the Doppler effect. For 33 BL Lac objects given by Burbidge & Hewitt (1987), the corrected apparent magnitude m(v)corr-log z diagram (Fig. 1) shows a good correlation.
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