New in version 2.2 is the option to control the number of continuum bins. Continuum bins are logarithmically spaced between 0.1 eV and 40 keV, and are calculated according to:

ncn2 must be in the range between 999 and 999999. The higher value is appropriate for use in modeling X-ray grating spectra. The lower value is appropriate for models where only integrated line luminosities or ionization fractions are desired. Execution time scales approximately proportionately to ncn2.

Tim Kallman 2015-01-11