Electron density vs. temperature for dereddened line ratios of the SOR of SN 1987A, using UVES data. The left panel shows the data from the 2002 epoch, while the right profile the 2009 epoch. In both panels the shown lines are: [N II] λλ6548, 6581/λ5755 (solid), [O III] λλ4959, 5007/λ4363 (dotted), [S II] λ6716/λ6731 (dashed) and [O II] λλ3726, 3729 (double-dotted dashed).
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