Comparison between models with different relative X-ray luminosity and shock temperature parameters. The thin gray line is the normalized UV spectrum and the colored lines are the CMFGEN models. The blue filled line is the model with T_X = 0.5 MK and log(L_X/L) = −7.4. The purple dashed line has the same temperature, but with a lower log(L_X/L) = −8.0. The red dot-dashed line has the same log(L_X/L) = −7.4, but a higher T_X = 1.0 MK. The different L_X are obtained by varying the X-ray emission filling factor. All the additional X-ray parameters are kept the same for all the models.