Optional data files for pysynphot

 pysynphot simulates photometric data and spectra as they are observed with
 the Hubble Space Telescope (HST).
 .
 This package downloads the data files for synphot and pysynphot:
 .
  * HST component throughput files and graph and component lookup tables,
  * Stellar and galactic model files,
  * the Castelli and Kurucz 2004 Atlas,
  * the Kurucz 1993 Atlas,
  * the Phoenix Models, and
  * the HST Calibration Spectra.
 .
 Note that installing this package will cause downloading more than 600 MB of
 data from archive.stsci.edu.