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Fig. 4.


Grid of models of radiative shocks from Sutherland & Dopita (2017) with varying magnetic-field strengths and shock velocities in a diffuse medium with pre-shocked density of 0.1 cm−3. Top row: FUV/NUV ratio from the models (left), line/continuum ratio in the GALEX FUV bandpass (center, similar behaviors are found in the NUV case), Hα emission (right). The line-to-continuum ratio is centered around 0 so that blue (red) colors correspond to larger (smaller) continuum emission compared to line emission. Bottom row: ion line to Hα ratios for OIII (left), SII (center), and NII (right). In all six panels the black contours represent the 1σ level of the observed FUV/NUV of 0.31 ± 0.05.

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