Calculate the luminosity of the current model for a given redshift and
rest frame energy range.
XSPEC> lumin [<lowEnergy> [<hiEnergy>] [<redshift>]
where <low Energy> and <hi Energy> are the rest frame energies over which
the luminosity is calculated and <redshift> is the source redshift. Initial
default values are 2 to 10 keV for 0 redshift. The luminosity is given in
units of ergs/s. The energy range redshifted to the observed range must be
contained by the range covered by the current data sets (which determine the
range over which the model is evaluated). Values outside this range will be
automatically reset to the extremes. Note: The energy values are two separate
arguments, and are NOT connected by a dash (see parameter ranges in the
freeze command description).