Abstract
We present an atlas of 96 low dispersion spectra of T Tauri stars, both classical and weak-lined. The flux-calibrated spectra extend from Hβ to well blueward of the Balmer jump. Observed equivalent widths and rough blue veilings are presented. We model stars with excess emission as a combination of a weak-lined T Tauri star of a similar spectral type and a slab of hot hydrogen. We tabulate the physical parameters of the slab, and give both intrinsic and observed Balmer jumps. The region responsible for the excess blue continuum has a high density and small surface area, in agreement with previous work. This is consistent with the boundary layer hypothesis, but not unique to it. We suggest that the emission region may actually be the stellar photosphere, heated by accretion shocks at the footpoints of magnetic loops extending to the disk
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