Fig. 2
Diagnostic diagram for the flux ratios (F4959 + F5007)/F4363 (solid lines) and (F6548 + F6583)/F5755 (dashed lines) at the three epochs Mar. 15 (blue), April 11 (black), and May 12 (red). Each line represents the loci of density and temperature that match the observed flux ratios. Fluxes correspond to the dereddened spectra.
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