The HEASARC welcomes your participation in a brief survey to capture how users access and utilize HEASARC data, software, and services. The outcome(s) of this survey will be used to guide, prioritize, and plan our activities and development in the coming years. It contains 20 questions, generally takes just a few minutes to complete, and your answers will remain totally anonymous. The survey is open until Dec 18, 2023. We thank you in advance for your valuable feedback.

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Special Characters

XPI recognizes the following special characters: 


! - indicates the rest of the line is a comment
@ - starts reading commands from a command file
$ - spawn to the system
" - protects other special characters
= - seperate parameter-value pairs


As a result, you should observe the following rules when entering expressions on the command line.


  • An argument with imbedded spaces must be delimited by double quotes.

  • An argument containing an @ or a ! must be surrounded by double quotes.

  • = signs are trapped by XPI, so use .eq. in selection expressions, or surround your expressions with double quotes. In fact, to be safe it is always best to do this anyway.



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Last modified: Tuesday, 10-Jan-2023 11:03:00 EST

The HEASARC welcomes your participation in a brief survey to capture how users access and utilize HEASARC data, software, and services. The outcome(s) of this survey will be used to guide, prioritize, and plan our activities and development in the coming years. It contains 20 questions, generally takes just a few minutes to complete, and your answers will remain totally anonymous. The survey is open until Dec 18, 2023. We thank you in advance for your valuable feedback.