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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filter grade

This filter is for missions with CCD detectors whose events are assigned a grade (or pattern). The grade can be specified as a single number (eg 0), a range (eg 0:2 or 0-2), an upper limit (eg $<$ 4), or a lower limit (eg $>$ 3). Specifications should be separated by commas (eg 0,2-6) and enclosed in double quotes if given on the command line instead of when prompted.


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Last modified: Tuesday, 10-Jan-2023 11:03:01 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.