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On the planetary nebula NGC 3918.

Pena, M.; Torres-Peimbert, S.

We have obtained for this nebula high dispersion lUE spectra in the short and long wavelength ranges and with different exposure times. We have measured the emission line intensities and analyzed them. The density derived fiom different ions confirm that the nebula has no systematic density variations. The collisionally excited lines of [Mg V] 278…