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Qualifiers for O stars

((f)) Weak N III 4634-40-42 emission, strong He II 4686 absorption
(f) Medium N III 4634-40-42 emission, neutral or weak He II 4686 absorption
f Strong N III 4634-40-42 emission, He II 4686 emission above continuum
((f*)) N IV 4058 emission >= N III 4640 emission, strong He II 4686 absorption (O2-3)
(f*) N IV 4058 emission >= N III 4640 emission, weaker He II 4686 absorption (O2-3.5)
f* N IV 4058 emission >= N III 4640 emission, He II 4686 emission (O2-3.5)
((fc)) As ((f)) plus C III 4647-50-51 emission equal to N III 4634
(fc) As (f) plus C III 4647-50-51 emission equal to N III 4634
fc As f plus C III 4647-50-51 emission equal to N III 4634
f?p Variable C III 4647-50-51 emission >= N III 4634-40-42 at maximum; variable
   sharp absorption, emission, and/or P Cygni features at H and He I lines
((f+)) As ((f)) plus Si IV 4089-4116 emission (O4-8, obsolete)
(f+) As (f) plus Si IV 4089-4116 emission (O4-8, obsolete)
f+ As f plus Si IV 4089-4116 emission (O4-8, obsolete)
(e) Probable H alpha emission but no red spectrogram available
e Emission components in H lines
pe As e with emission components in He I and/or continuum veiling
[e] Emission spectrum including Fe forbidden lines
e+ Fe II and H emission lines (subcategories in Lesh 1968)
((n)) Broadened lines (not applied in GOSSS, marginal)
(n) More broadened lines (v sini ~ 200 km/s)
n Even more broadened lines (v sin i ~ 300 km/s)
nn Yet even more broadened lines (v sin i ~ 400 km/s)
[n] H lines more broadened than He lines
nfp He II centrally reversed emission, broadened absorption lines (Conti Oef)
N N absorption enhanced, C and O deficient
Nstr Moderate case of above (e.g. N III 4640 enhanced but not > C III 4650)
C C absorption enhanced, N deficient
Nwk Moderate case of above
var Variation in line spectrum intensities or content
p Peculiar spectrum
z He II 4686 in absorption and > than both He I 4471 and He II 4542