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... spectrum.3.1
This generalizes and replaces the “/b” technique of specifying background models used in v11. 
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... file.5.1
For OGIP files, any FITS NULL values will be converted to the value 1.E-32. This should have no practical effect because any channels with NULL values will presumably be marked as bad or otherwise ignored. 
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... one.6.1
In principle, it is possible to use untested versions of the model with the CYCnorm forced to negative values to mimic an emission around the sonic point. 
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... PGPLOTD.1
PGPLOT is the name of a Graphics Subroutine Library written by T. J. Pearson at the California Institute of Technology 
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