range in consideration of using the H$_2$ fluorescence emission profiles given by the CLOUD code [@van86; @bla87], a simulation model for a photodissociation region (PDR). We assumed that the intensity ratios among the lines were the same for the entire OES region. The resulting emission intensity was expressed in terms of CU by dividing the total intensity with the wavelength range, and subtracted from the diffuse emission map.

It was mentioned in @jo11 that two-photon emission constitutes about 50$\%$-70$\%$ of the FUV continuum intensity in the lower part of arc A and arc B, based on the assumption that 1 Rayleigh of the H$\alpha$ line corresponds to the two-photon (plus free-free and bound-free) continuum emission of 60 CU in an ionized gas [@rey90]. On the other hand, @seo11 recently suggested that the contribution of two-photon effects to the FUV continuum could be lower in the case of cooling ionized gas with 1 Rayleigh of the H$\alpha$ line corresponding to $\sim$26.0 CU. Furthermore, Figure 6 of @wit10, which shows the data for the OES region studied by @mad06, suggests that 10 to 40$\%$ of the total H$\alpha$ intensity comes from dust scattering. These complexities make it difficult to estimate the effect 