Empirical correlation between the total filament mass per unit length (Mlin (total)) and the obtained surface density of fertile fibers (Σ (fertile)) in Musca (green), B213-L1495 (black), NGC1333 (orange), and ISF (red). The dashed line indicates the least-square fit of the above four clouds for which Σ (fertile) ~ 0.1 ×Mlin(total). The shaded blue area shows the expected variations of a factor of 2 respect to this linear correlation. Blue and gray arrows indicate the proposed tendency of these fiber networks to form either isolated (bottom) or clustered (top) stellar populations and both low- (left) and high-mass (right) stars.
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