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Table 1

Evolution of the number of stars remaining after successive selection criteria are applied.

Selection criteria FM07 VA04 WE23 SA85 KR09 Total

Heiles (2000) 9286
pV/σpV> 3 5579
PS/σPS> 3 at 5 3030
AV/σAV> 3 128 245 338 575 980 2266
Indep. samples 128 147 207 324 653 1459
Diffuse ISM 39 35 43 89 146 352
Column density 34 26 34 58 74 226
Position angles 32 22 31 54 67 206

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