Fig. 9.
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FWHM(Al IIIλ1860) vs. FWHM(C III]λ1909) for Pop. 
* [FWHM(C III]) ≠ FWHM(Al III)] sources. The dots are colour-coded as Figures above by population. The dashed line traces the 1:1 relation; the black line is the best fit obtained using the least-square method and the orange one is the line of FWHM(C III]) = 0.9 FWHM(Al III). The cross shows sIQRs of the uncertainties.
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