Table 4: Observational parameters of the C18O and HCO+ lines.

Source		 W [K km s-1] $\Delta v$ [km s-1] W [K km s-1]
  (C18O) (C18O) (HCO+)
L 1448 IRS 2 $3.23 \pm 0.05 $ $0.77 \pm 0.01 $ $13.0 \pm 0.3\rm ^{*}$
L 1448 IRS 3 $5.75 \pm 0.07 $ $1.22 \pm 0.01 $ $29.0 \pm 0.3$
L 1448 C $3.36 \pm 0.06 $ $1.11 \pm 0.01 $ $20.6 \pm 0.3\rm ^{*}$
L 1455 A1 $1.65 \pm 0.06 $ $1.03 \pm 0.01 $ $ 8.8 \pm 0.3$
L 1455 A2 $0.90 \pm 0.05 $ $0.80 \pm 0.01 $ $ 6.5 \pm 0.3$
Per 4 S $2.84 \pm 0.06 $ $0.81 \pm 0.01 $ $ 8.7 \pm 0.3$
Per 4 N $1.30 \pm 0.04 $ $0.44 \pm 0.01 $ $ 5.3 \pm 0.3$
Per 5 $1.79 \pm 0.05 $ $0.69 \pm 0.01 $ $15.0 \pm 0.3$
Per 6 $1.52 \pm 0.05 $ $0.74 \pm 0.01 $ $ 6.1 \pm 0.3\rm ^{*}$
IRAS 03282 $1.95 \pm 0.07 $ $1.47 \pm 0.01 $ $12.8 \pm 0.3\rm ^{*}$
Barnard 1-B $8.09 \pm 0.08 $ $1.59 \pm 0.01 $ $14.0 \pm 0.3\rm ^{*}$
HH 211 $5.19 \pm 0.06 $ $0.81 \pm 0.01 $ $17.4 \pm 0.3\rm ^{*}$
Barnard 5 IRS 1 $3.99 \pm 0.06 $ $1.00 \pm 0.01 $ $ 9.3 \pm 0.3\rm ^{*}$
L 1527 $4.12 \pm 0.06 $ $0.65 \pm 0.01 $ $13.0 \pm 0.3\rm ^{*}$
L 483 $5.12 \pm 0.06 $ $0.81 \pm 0.01 $ $22.8 \pm 0.3\rm ^{*}$
SMM 5 $8.66 \pm 0.08 $ $1.57 \pm 0.01 $ $10.7 \pm 0.3$
L 723 $2.45 \pm 0.08 $ $1.29 \pm 0.01 $ $12.2 \pm 0.3\rm ^{*}$
L 673 A $2.31 \pm 0.07 $ $0.92 \pm 0.01 $ $12.8 \pm 0.3$
B 335 $2.34 \pm 0.04 $ $0.44 \pm 0.01 $ $ 3.6 \pm 0.3\rm ^{*}$
L 1157 $1.57 \pm 0.05 $ $0.61 \pm 0.01 $ $13.4 \pm 0.3\rm ^{*}$

Integrated HCO+ intensities from double-peaked spectra are indicated with an *.

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