Table 4: Comparison of the average B-band host galaxy propertiesa.

Name		 N $\langle z\rangle$ $\langle M_{B}(\rm host)\rangle $ $\langle R_{\rm e}\rangle$
      mag kpc
(1) (2) (3) (4) (5)

BL Lacs (this work)		 18 $0.104\pm0.064$ $-21.6\pm0.7$ $7.6\pm3.2$
Quasars (Jahnke et al. 2004) 12 $0.094\pm0.043$ $-20.9\pm0.7$ $6.0\pm2.7$
FR I RGs (Govoni et al. 2000) 17 $0.069\pm0.031$ $-22.1\pm0.6$ $15.3\pm9.2$
FR II RGs (Govoni et al. 2000) 6 $0.050\pm0.016$ $-21.9\pm0.6$ $11.4\pm7.7$
aColumn (1) gives the sample; (2) the number of objects; (3) the average redshift; (4) the average host galaxy magnitude, and (5) the average effective radius ( $\langle R_{\rm e}\rangle$ for RGs are in R-band).

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