Table 2: Classification criteria based on dereddened line intensities relative to C IV-5806 = 100 for 42 CSPNe. The ratio also studied by CMB98 are shown in italics.

WO		 FWHM O VIII O VII O 79VI O 79VI O 79V C IV C IV C IV He 79II He 79II Other
  C IV 6068 5666 5290 3822 5590 7060 4650 5470 5412 4686 lines

WO1		 $33\pm 5$ $20\pm 8$ >25 >80 >1400 - $35\pm 20$ 3$00\pm 100$ $35\pm 5$ $45\pm 15$ $500\pm 200$ O V-6740 present
WO2 $32\pm 3$ $6\pm 1$ 10: $48\pm 2$ $1000\pm 200$ - $18\pm 4 $ $270\pm 60$ $23\pm 2$ $20\pm 4$ $300\pm 30$ for all [WO] types
WO3 $37\pm 6$ $2\pm 1$ $8\pm 6$ $20\pm 5$ $250\pm 40$ $27\pm 5$ $15\pm 4$ $140\pm 60$ $14\pm 2$ $15\pm 4$ $130\pm 30 $ (rel.int. 2 to 5);
WO4 $52\pm 6$ - 1 $3\pm 1$ 1$0\pm 6 $ $9\pm 5$ $3.5\pm .5$ $55\pm 10$ $4\pm 2$ $4\pm 2$ $25\pm 15$ 5696 (<1) for [WO4]
WO4pec $80\pm 2$ - $1.5\pm 1$ $3\pm 1$ $10\pm 6$ $4\pm 1$ $3\pm 1$ $35\pm 10$ $4\pm 2$ $3\pm 2$ $ 30\pm 20$ and [WO4pec]

WC		 FWHM C III C 79III C III C III C 79II C II C II C II C II C III-5696/ Other
  C IV/III 6730 5696 4649 7037 4267 6461 7118 7058 7235 O III-5592 lines
WC4 $37\pm 8$ 1: <1 7$0\pm 20$ <1 - <1 2: 2: 1: <0.5 [WC4] to [WC9]:
WC5-6 $25\pm 3$ 10: $10\pm 3$ $210\pm 30$ - 12: 6: $10\pm 5$ 13: $7\pm 5$ $4\pm 3$ 5470 (4 to 20),
WC7-8 $22\pm 3 $ 35: $60\pm 30$ 360: 7: - 4: 12: - 15: $ 8\pm 2$ 5592 (3 to 20),
WC9 $25\pm 9$ $40\pm 10$ $260\pm 100$ $360\pm 60$ $ 15\pm 6$ $130\pm 50$ $ 10\pm 4$ $18\pm 2$ $ 8 \pm 4$ $ 70\pm 20$ $25\pm 10$ 5412 (3 to 12),
WC9pec 8 28 550 740 15 100 16 10 - 150 110 4686 (40 to 90);
WC10 $6\pm 1$ - $850\pm 150$ >1000 $200\pm 60$ >1500 $270\pm 80$ 300: $ 300\pm 100$ >2000 $70\pm 30$ [WC11] : abs. lines
WC11 5 - >1000 - - > 1400 500: - - >3000   of He II, O III, C IV


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