Table 8: Physical parameters of massive and low-mass cores.
Parameter Massive cores Low-mass cores
      With stars Without stars
  Mean Number Mean Number Mean Number

$\Delta V$ (km s-1)		 2.5(0.8) 31 0.5(0.3) 35 0.3(0.1) 25
N(N2H+) (1012 cm-2) 29(33) 36 8(5) 35 6(3) 25
d (pc) 0.5(0.2) 36 0.14(0.03) 22 0.1(0.02) 13
Axial ratio 1.4(0.4) 47 1.9(0.7) 35 2(1) 19
$n_{\rm vir}$(104 cm-3) 6(4) 36 20(20) 34 12(7) 19
$M_{\rm vir}$($M_{\odot}$) 658(604) 36 9(16) 34 3(2) 19
X(N2H+) (10-10) 5(3) 36 3(2) 34 2(1) 18
p 1.3(0.1) 25 1.2(0.3) 9 0.8(0.1) 8
$\Gamma$(km s-1 pc-1) 0.5(0.4) 27 2(1) 14 2(1) 12
$\beta$ 0.01(0.02) 27 0.02(0.02) 13 0.02(0.02) 7


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