Before I start I should make you aware of the following references:
www.etacarinae.iag.usp.br/
www.espacioprofundo.com.ar/foros/about8064.html
The first shows the movements of the HeII (4686) and N+(5755), the second a SA spectra of the 12 Feb.
Just started on Mark's "eta carinae spectra crop.spc"- #1 [BLUE] and Jeff's "ecara.spc" -#2 [RED] and straight away you can see similarities and some ( significant?) differences!!
#1 has a double Ha peak, were #2 is single
A second peak at 6876 on #1 is missing on #2
Neither of these match the foros spectra which has a large "ramp" up to the Ha and seems to have a line "reversal" at around 4860.
let the fun begin....................