  [LaTeX removed] Recent work has shown that it is possible to systematize
quasar spectral diversity in a parameter space called ``Eigenvector 1'' (E1).
We present median AGN spectra for fixed regions of the E1 (optical) parameter
space (FWHM(H-beta) vs. equivalent width ratio RFE=W(FeII4570)/W(H-beta).
Comparison of the median spectra for different regions show considerable
differences. We suggest that an E1-driven approach to median/average spectra
emphasizes significant differences between AGN, and offers more insights into
AGN physics and dynamics than a single population median/average derived from a
large and heterogeneous sample of sources. We find that the H-beta broad
component line profile changes in shape along the E1 sequence both in average
centroid shift and asymmetry. While objects with FWHM(H-beta)< 4000 km/s are
well fitted by a Lorentz function, AGN with FWHM(H-beta)> 4000 km/s are well
fitted if two broad line components are used: a broad (the "classical" broad
line component) and a very broad/redshifted component.
