LPBLs identified in Paper I (blue circles). They lie in the “forbidden zone” of the Dn(4000) versus the W2–W3 diagram, which is defined by the Dn(4000) limit obtained by requiring that the nonthermal jet contribution is at least 1/3 of the host galaxy one at 3900 Å, and by the 1-sigma lower limit to the average relation holding for the 21 065 bright nearby galaxies (black dots; see Paper I for details).