Thu, 12/26/2013 - 09:06
To the topic above, an amateur investigation has been performed.
See:
http://astrospectroscopy.de/NRP%20or%20clouds%20in%20zeta%20Tau.pdf
Ernst Pollmann
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ASPA-Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete