Figure 1 in @jo11. The contribution of H$_2$ fluorescent emission amounts to $\sim$35$\%$ of the continuum intensity near the western edge of the lower part of arc A. The intensity levels of this region decreased from $\sim$2,000 CU to $\sim$1,200 CU after subtraction of H$_2$ emission. Two-photon effects of hydrogen atom are clearly seen in the two strong H$\alpha$ filamentary structures, arc A and arc B, whose centroids are depicted as thick black solid lines in Figure \[fig:fims\](a).

As Figure \[fig:fims\](a) generally shows high FUV intensity in the regions where the color excess *E*(*B-V*) is large, we made a pixel-to-pixel scatter plot of the FUV intensity against dust extinction in Figure \[fig:fims\](b) to check the correlation between them. A correlation is seen for *E*(*B-V*) &lt; 0.14, especially for the FUV intensity less than 1500 CU, while FUV intensity becomes scattered and more or less independent of dust extinction for *E*(*B-V*) above 0.14. In fact, it should be noted that the color excess value of $\sim$0.14 corresponds to the optical depth of $\tau$ $\sim$ 1 at 1565 [Å]{}. The result agrees well with the general notion that the FUV continuum and dust extinction have a correlation in an optically thin region. 