Table 3: H2CO line parametersa.

Line		 Species Rest $\int$ $(T_{\rm L}$/$T_{\rm c}$)dV $V_{\rm hel}$ $\Delta V_{1/2}$ $\vert T_{\rm L}\vert$/$T_{\rm c}$ $S_{\rm A}$/ $S_{\rm tot}$ Optical
    frequency           depth
    (GHz) (km s-1)      
110-111 O 4.82 - $0.073\pm0.006$ $5.3\pm0.2$ $5.1\pm0.5$ $0.014\pm0.002$ 0.56 0.025 $\pm$ 0.006
211-212 O 14.48 - $0.038\pm0.004$ $5.1\pm0.4$ $8.7\pm0.9$ $0.004\pm0.0006$ 0.70 0.006 $\pm$ 0.002
101-000 P 72.83 - $1.154\pm0.097$ $5.7\pm0.2$ $5.3\pm0.5$ $0.217\pm0.028$ 0.77 0.331 $\pm$ 0.047
      - $0.175\pm0.066$ -$6.9\pm0.4$ $2.7\pm0.5$ $0.065\pm0.027$   0.088 $\pm$ 0.036
212-111 O 140.83 - $1.721\pm0.063$ $5.8\pm0.1$ $5.7\pm0.3$ $0.300\pm0.018$ 0.77 0.493 $\pm$ 0.051
      - $0.304\pm0.046$ -$6.9\pm0.2$ $3.1\pm0.6$ $0.098\pm0.024$   0.136 $\pm$ 0.035
202-101 P 145.60 - $1.047\pm0.052$ $6.0\pm0.1$ $5.1\pm0.4$ $0.206\pm0.018$ 0.77 0.311 $\pm$ 0.034
      - $0.105\pm0.029$ -$7.3\pm0.3$ $1.9\pm0.7$ $0.056\pm0.026$   0.076 $\pm$ 0.034
211-110 O 150.49 - $2.458\pm0.102$ $5.8\pm0.1$ $5.4\pm0.3$ $0.454\pm0.028$ 0.77 0.890 $\pm$ 0.071
      - $0.363\pm0.056$ -$7.4\pm0.2$ $2.2\pm0.4$ $0.164\pm0.037$   0.240 $\pm$ 0.053
a Columns 1 and 2: H2CO transition (O: ortho; P: para). Column 3: rest frequency. Columns 4-7: Integrated line-to-continuum ratios, heliocentric velocity with respect to z=0.68466, linewidth, and peak line-to-continuum ratio. The latter is calculated dividing the velocity integrated line-to-continuum ratios by the linewidth. The errors given are formal standard deviations that do not include calibration uncertainties. Column 8: continuum flux density of image A w.r.t. the total continuum flux density. The error is about $\pm$0.03. Column 9: peak "apparent'' optical depth, i.e. $\tau$ = -ln(1- $\vert T_{\rm L}\vert$/$T_{\rm c}$), assuming uniform coverage of image A and an H2CO excitation temperature that is small w.r.t. the continuum background.

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