John,
I calibrated your 3 spectra in the BAA database in absolute flux using V magnitudes interpolated at the times of your spectra from V magnitudes in the AAVSO photometric database. I have labelled the main emission lines which include the Balmer series of hydrogen recombination lines and collisionally excited lines of singly ionised iron Fe II. The latter have strengthened during the recent rebrightenings of the nova. There are also forbidden lines of oxygen [O I] formed in the lower density expanding nebula.
David
