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Table 1

Typical dissipation scales of ambipolar diffusion for different interstellar conditions.

Medium nn B X lAD
[cm-3] [μG] [pc]

Molecular clouds 104 80 1 × 10-7 0.1
Cold H i 40 6 1 × 10-4 0.02
Warm H i 0.5 6 3 × 10-3 0.5

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