In total around 80 lines were measured. This part of the spectrum is the noisiest and weak lines are not seen. Therefore, this line could be considered an intermediate strength line in this part of the spectrum. As can be seen strong lines of high ionization stages of some ions are seen.
Hydrogen lines are abundant.
NGC7072's spectrum is extremly rich as can be seen in Fig. 1 . Several stages of ionization of some ions were not observe. Then, an upper limit to the flux was determined, as described in the previous section. Also noticiable in the spectrum is the strong continuum at the longest wavelength and the features at 3.3, 6.6, 7.7, 8.8 and 11.2 m now known as PAHs as well as a broad PAH plateau from 15 to 20 m. In this paper we will concern ourselves only with the emission lines.