Readme file for the files containing the low Z ultraviolet spectra described
in Leitherer et al. (ApJ, in press for the March 2001 issue)

There are 66 tables. Each table has 4 columns with 860 lines and contains the
synthetic ultraviolet spectrum from 1205 A to 1849 A as discussed in the paper.
(The fluxes longward of 1601 A are placeholders with no useful information.)
The first column gives the age in yr, column 2 is the wavelength in Angstrom,
column 3 is the luminosity [erg/sec/Angstrom], and column 4 is the normalized
spectrum.

The filename uniquely identifies the starburst models. 
The nomenclature is low_x_k_j. 

x is i or c, indicating instantaneous (i) or continuous star formation (c).
k is 235, 330, and 30, which stands for IMF exponent/upper mass cut-off
  combinations  of 2.35/100, 3.30/100, and 2.35/30, respectively.
j is the age in Myr. The timesteps are different for the instantaneous and
  continuous models.

Example:  low_c_330_20 contains the spectrum for continuous star formation
          at age 20 Myr, IMF exponent of 3.30, and M_up=100 M_sol.