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$\begin{figure} \par\includegraphics[angle=-90,width=7.5cm]{Hk213_f1.eps}\end{figure}$ Figure 1: CF⁺ J=1-0 spectra observed at each of the positions in the Orion Bar, with the observed position for each observation indicated on a $\rm ^{13}CO$ J=3-2 map of the source (grayscale map, from Lis & Schilke 2003). For the strip centered on $(\alpha ,\delta ) = \rm (05^h35^m22.8^s$ , $\rm -05^\circ 25^\prime 01^{\prime \prime })$ (J2000) (the "Orion Bar (CO)'' position), the integrated CF⁺ J = 1-0 antenna temperatures are $33 \pm 6$ , $45 \pm 8$ , $86 \pm 10$ , $125 \pm 13$ and $57 \pm 8~\rm mK~km~s^{-1}$ from NW to SE (quoted uncertainties are 1 $\sigma$ statistical errors); for the strip centered on $\rm (05^h35^m25.3^s$ , $\rm -05^\circ 24^\prime 34^{\prime \prime })$ (J2000) (the "Orion Bar (HCN)'' position), the corresponding values are <19.5, <15.8, $72 \pm 8$ , $119 \pm 15$ , and $140 \pm 30$ $\rm mK~km~s^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=6.6cm]{Hk213_f2.eps}\end{figure}$ Figure 2: CF⁺ J=1-0, J=2-1 (IRAM 30 m) and J=3-2 (APEX 12 m) spectra obtained toward the Orion Bar (CO) and Orion Bar (HCN) positions. (Spectra of lower signal-to-noise ratio, obtained in shorter integrations toward the Orion Bar (CO) position, were published previously by Neufeld et al. 2005b.)
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.2cm]{Hk213_f3.eps}\end{figure}$ Figure 3: Rotational diagram for CF⁺. The error bars include systematic uncertainties, which we estimate as $\pm$ 20%. The solid curves show a fit to the data, in which the critical density for each transition is assumed proportional to the radiative decay rate.
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In the text

$\begin{figure} \par\includegraphics[width=7cm]{Hk213_f4.eps}\end{figure}$ Figure 4: a) Upper panel: CF⁺ column density, $N({\rm CF^+})$ , predicted by the NWS model, as a function of the normalized incident radiation field $\chi _{\rm UV}$ . b) Lower panel: corresponding $N({\rm CF^+})/N({\rm C^+})$ ratio. Each curve is labelled with the assumed density, $n_{\rm H}$ . The crosses represent the mean observed values for the Orion Bar (CO) and Orion Bar (HCN) positions, along with the radiation field $\chi _{\rm UV} = 3 \times 10^4$ estimated by Herrmann et al. (1997) for the Orion Bar, while the open circles represent the corresponding model prediction.
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In the text

$\begin{figure} \par\includegraphics[width=6.6cm]{Hk213_f2.eps}\end{figure}$	Figure 2: CF⁺ J=1-0, J=2-1 (IRAM 30 m) and J=3-2 (APEX 12 m) spectra obtained toward the Orion Bar (CO) and Orion Bar (HCN) positions. (Spectra of lower signal-to-noise ratio, obtained in shorter integrations toward the Orion Bar (CO) position, were published previously by Neufeld et al. 2005b.)
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$\begin{figure} \par\includegraphics[angle=-90,width=7.2cm]{Hk213_f3.eps}\end{figure}$	Figure 3: Rotational diagram for CF⁺. The error bars include systematic uncertainties, which we estimate as $\pm$ 20%. The solid curves show a fit to the data, in which the critical density for each transition is assumed proportional to the radiative decay rate.
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