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In order to test the performance of the parallel code in a practical
application with velocity fields we calculated a supernova atmosphere
model with parameters typical for a Type Ia supernova explosion. The
total number of wavelength points = 48397, the total number of levels
treated in NLTE = 3752, and the total number of primary NLTE
transitions = 16594, the number of secondary NLTE transitions =
184943, and the number of LTE lines=2346474. Fig. 3a displays
the wall-clock time for a single model iteration as a function of
processors and Fig. 3b shows the speed-up, which in agreement
with our above results scales roughly as . While this is
significantly below the theoretical maximum of scaling, it is a
significant speed-up for practical applications.

*Peter H. Hauschildt*

*4/27/1999*