Table 2: Least-squares fit parameters of the $\lambda$ 8037 CH₂CN^- models shown in Fig. 3. The mean LSR velocity ( $v_{\rm LSR}$ / km s^-1), Doppler cloud width (b/km s^-1) and equivalent width of the model $\lambda$ 8037 DIB (W₈₀₃₇/mÅ) are given along with the normalised continuum rms of the observed spectra ( $\sigma _{\rm c}$ ), and the rms of the model fit residuals ( $\sigma _{\rm f}$ ).
Sightline $v_{\rm LSR}$ b W₈₀₃₇ $\sigma _{\rm c}$ $\sigma _{\rm f}$

Cyg OB2 5 13.9 21.6 32.5 0.0020 0.0014

Cyg OB2 8a 12.3 21.0 30.2 0.0024 0.0016

Cyg OB2 12 9.4 24.0 38.3 0.0024 0.0013

HD 168112 29.9 26.4 24.5 0.0018 0.0021

HD 169034 13.6 33.0 38.7 0.0036 0.0024

HD 183143 25.0 18.0 37.5 0.0022 0.0012

HD 186745 19.3 16.2 24.3 0.0014 0.0013

HD 229196 14.1 21.6 22.0 0.0020 0.0012

**Table 2:** Least-squares fit parameters of the $\lambda$ 8037 CH₂CN^- models shown in Fig. 3. The mean LSR velocity ( $v_{\rm LSR}$ / km s^-1), Doppler cloud width (b/km s^-1) and equivalent width of the model $\lambda$ 8037 DIB (W₈₀₃₇/mÅ) are given along with the normalised continuum rms of the observed spectra ( $\sigma _{\rm c}$ ), and the rms of the model fit residuals ( $\sigma _{\rm f}$ ).
Sightline	$v_{\rm LSR}$	b	W₈₀₃₇	$\sigma _{\rm c}$	$\sigma _{\rm f}$
Cyg OB2 5	13.9	21.6	32.5	0.0020	0.0014
Cyg OB2 8a	12.3	21.0	30.2	0.0024	0.0016
Cyg OB2 12	9.4	24.0	38.3	0.0024	0.0013
HD 168112	29.9	26.4	24.5	0.0018	0.0021
HD 169034	13.6	33.0	38.7	0.0036	0.0024
HD 183143	25.0	18.0	37.5	0.0022	0.0012
HD 186745	19.3	16.2	24.3	0.0014	0.0013
HD 229196	14.1	21.6	22.0	0.0020	0.0012

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