  The Space Telescope Imaging Spectrograph (STIS) has measured the spectral
energy distributions (SEDs) for several stars of types O, B, A, F, and G. These
absolute fluxes from the CALSPEC database are fit with a new spectral grid
computed from the ATLAS-APOGEE ATLAS9 model atmosphere database using a
chi-square minimization technique in four parameters. The quality of the fits
are compared for complete LTE grids by Castelli & Kurucz (CK04) and our new
comprehensive LTE grid (BOSZ). For the cooler stars, the fits with the MARCS
LTE grid are also evaluated, while the hottest stars are also fit with the NLTE
Lanz & Hubeny OB star grids. Unfortunately, these NLTE models do not transition
smoothly in the infrared to agree with our new BOSZ LTE grid at the NLTE lower
limit of Teff =15,000K.
  The new BOSZ grid is available via the Space Telescope Institute MAST archive
and has a much finer sampled IR wavelength scale than CK04, which will
facilitate the modeling of stars observed by the James Webb Space Telescope
(JWST). Our result for the angular diameter of Sirius agrees with the ground-
based interferometric value.
