The relationships between the different parameters used to trace the physical properties characterizing the target galaxies: the logarithm of the star formation rate SFR (in M_⊙ yr^-1), the logarithm of the birthrate parameter b (or SSFR), the logarithm of the Hα effective surface brightness (in erg s^-1 kpc^-2), the H-band effective surface brightness (in AB mag arcsec^-2), the metallicity index 12 + log (O/H), the Balmer decrement A(Hα) (in magnitudes) and the FUV attenuation A(FUV) (in magnitudes). Red open circles for Sa-Sb, green empty triangles for Sbc-Scd and blue open squares for Sd-Im-BCD. The typical error bar is indicated with a black cross.