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The interpretation of the main sequence of quasars has become a frontiersubject in the last years. The consider the effect of a highly flattened,axially symmetric geometry for the broad-line region (BLR) on the parametersrelated to the distribution of quasars along their Main Sequence. We utilizethe photoionization code CLOUDY to model the BLR, assuming `un-constant' virialfactor with a strong dependence on the viewing angle. We show the preliminaryresults of the analysis to highlight the co-dependence of the Eigenvector 1parameter, R$_{\mathrm{FeII}}$ on the broad H$\beta$ FWHM (i.e. the linedispersion) and the inclination angle ($\theta$), assuming fixed values for theEddington ratio ($\mathrm{L_{bol}}/\mathrm{L_{Edd}}$), black hole mass($\mathrm{M_{BH}}$) and spectral energy distribution (SED) shape. We considerfour cases with changing cloud density (n$\rm{_{H}}$) and composition.Understanding the FeII emitting region is crucial as this knowledge can beextended to the use of quasars as distance indicators for Cosmology.

FeII emission in NLS1s -- originating from denser regions with higher abundances?