...).¹

For prior work on PG1211+143 , we are assuming that all references to velocities are true velocities in the rest frame of PG1211+143 , with $v$ in $\rm km~s^{-1}$ converted to $zc$ simply by dividing by $c=2.9979 \times 10^5~\rm km~s^{-1}$.

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... package²

http://space.mit.edu/asc/isis/

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... program³

http://space.mit.edu/cxc/analysis/aglc/

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...mpi_xstar ⁴

http://github.com/xstarkit/mpi_xstar/

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...warmabs component.⁵

Lacking compelling statistics for any redshift other than the component with $z_{\rm obs}\approx0.02$, we choose this value to keep the fit tractable.

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... ISISscripts⁶

http://www.sternwarte.uni-erlangen.de/isis/

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