Important note

Although XSTAR is designed to be relatively user-friendly, and is supplied along with user-oriented software for data analysis, its use inevitably implies risk of incorrect or undesired results. Common among these are application to situations where the physical assumptions or numerical accuracy breaks down, or attempts to solve problems beyond the capabilities of the machine being used. The user is urged to read chapter 6, `Problems and Pitfalls', before attempting changes to parameter values far beyond those in the sample parameter files.