
1.0  the version from xspec v11.1 
1.1  as 1.0 but with updated ionization fractions using dielectronic recombination rates from Mazzotta et al (1998) 
2.0  same ionization fractions as 1.1 but uses AtomDB v2 to calculate the resulting spectrum 
3.x  ionization fractions and spectrum calculation uses AtomDB v3.x 
Note that versions 1.x have no emission from Ar. For versions 3.x and later additional xset options are available and are listed under the documentation for nei.
For the pshock model the parameters are:
par1  Plasma temperature (keV) 
par2  Metal abundances (He fixed at that defined by the abund command). The elements included are C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni. Abundances are defined by the abund command 
par3  Lower limit on ionization timescale in units of s/cm. 
par4  Upper limit on ionization timescale in units of s/cm. 
par5  redshift 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the vpshock model, the parameters are:
par1  Plasma temperature (keV) 
par2  H abundance (set to 0 for no freefree continuum, otherwise 1) 
par3–par14  Abundances for He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command) 
par15  Lower limit on ionization timescale in units of s/cm. 
par16  Upper limit on ionization timescale in units of s/cm. 
par17  Redshift, z 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the vvpshock model, the parameters are:
par1  Plasma temperature (keV) 
par2  H abundance (set to 0 for no freefree continuum, otherwise 1) 
par3–par31  Abundances for all elements with 2 Z 30 wrt Solar (defined by the abund command) 
par32  Lower limit on ionization timescale in units of s/cm. 
par33  Upper limit on ionization timescale in units of s/cm. 
par34  Redshift, z 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the bpshock model the parameters are:
par1  Plasma temperature (keV) 
par2  Metal abundances (He fixed at that defined by the abund command). The elements included are C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni. Abundances are defined by the abund command 
par3  Lower limit on ionization timescale in units of s/cm. 
par4  Upper limit on ionization timescale in units of s/cm. 
par5  redshift 
par6  gaussian velocity broadening (sigma in km/s) 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the bvpshock model, the parameters are:
par1  Plasma temperature (keV) 
par2  H abundance (set to 0 for no freefree continuum, otherwise 1) 
par3–par14  Abundances for He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command) 
par15  Lower limit on ionization timescale in units of s/cm. 
par16  Upper limit on ionization timescale in units of s/cm. 
par17  Redshift, z 
par18  gaussian velocity broadening (sigma in km/s) 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
Finally, for the bvvpshock model, the parameters are:
par1  Plasma temperature (keV) 
par2  H abundance (set to 0 for no freefree continuum, otherwise 1) 
par3–par31  Abundances for all elements with 2 Z 30 wrt Solar (defined by the abund command) 
par32  Lower limit on ionization timescale in units of s/cm. 
par33  Upper limit on ionization timescale in units of s/cm. 
par34  Redshift, z 
par35  gaussian velocity broadening (sigma in km/s) 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
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