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That's a great spectra! What was the set-up and total exposure??
OK, here's what I see....
Re-calibrate on the bright Ha in the red; this should be 6563A.
If I re-set your wavelengths by 28A ( 6591-6563) then I see:
From the blue to red>
Hgama @4340A
Hbeta @ 4861A
OIII @ 4959/5007A
the double bump @ 5154A; not sure? could be Mg?
This spectra is very typical of a hydrogen emission area. You can see now why the Ha/Hb/OIII filters work so well on this type of object.
For completeness the following are usually also in nebulae spectra:
NeIII @ 3869A
HeII @ 4686A
NII @ 6584A
All this coming from a guy who hasn't seen a star since Xmas!!
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