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Fig. 9


STIS Hα and Hβ low-resolution (dashed, blue) and medium-resolution (gray lines) observations (labeled with medium-resolution grating/central wavelength in Å). Because of uncertainty in the flux calibration, the medium-resolution data are normalized to the low-resolution flux. The flux around Hβ in the top plot is multiplied by a factor of 0.35. The red lines in the upper two plots are the medium-resolution (R ≈ 6000) spectra degraded to the low resolution (R ≈ 500) and agree with the low resolution (blue dash) within the uncertainty of the R = 500 resolution. The lower two plots are shifted down by 0.035 and 0.07 × 10-13 flux units, respectively. In the lowest plot, the model is overplotted in red after smoothing to the medium resolution. While the model Hα absorption is somewhat too weak, the central emission agrees with the observation within the uncertainty of the resolution (insert).

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