Edge-on projection of the FP in the g-band for the early-type galaxies in our sample. The black points represent the galaxies with z < 0.35, and the open red diamonds are the objects with z > 0.35. The small yellow points are the SDSS early-type galaxies of Bernardi et al. (2003), represented using the FP coefficients obtained from the maximum likelihood ortogonal fit by these authors. In the left panel, we show the zero-point (ZP) and the rms scatter (σ_tot) for our local sample when the a and b coefficients are fixed to those of Bernardi et al. (2003). In the right panel we present the same as for the left panel, but limiting our high-redshift sample and the SDSS one to the objects with absolute magnitudes in the range −21.5 > M_g > −22.5.