Atomic abundances are entered relative to solar abundances as defined in [Grevesse, Noels and Sauval 1996], with being defined as the solar value and the current default. Currently supported range for these values is .
For reference: the default solar abundances used by XSTAR are as follows:
H 1.00d+000 He 1.00d-001 Li 1.00d-10 Be 1.00d-10 B 1.00d-10 C 3.70d-004 N 1.10d-004 O 6.80d-004 F 3.98d-008 Ne 2.80d-005 Na 1.78d-006 Mg 3.50d-005 Al 2.45d-006 Si 3.50d-005 P 3.31d-007 S 1.60d-005 Cl 3.98d-007 Ar 4.50d-006 K 8.91d-008 Ca 2.10d-006 Sc 1.66d-009 Ti 1.35d-007 V 2.51d-008 Cr 7.08d-007 Mn 2.51d-007 Fe 2.50d-005 Co 1.26d-007 Ni 2.00d-006 Cu 3.16d-008 Zn 1.58d-008
The atomic species are all elements up to and including copper (Z=30). Note that as of version 2.2.0 many of these are treated using scaled hydrogenic atomic rate data.