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Last modified: 1 November 2024

URL: https://cxc.cfa.harvard.edu/ciao/bugs/chandra_repro.html
/ ciao4.17 / bugs / chandra_repro.html

Bugs: chandra_repro

For detailed information and examples of running this tool, refer to the chandra_repro ahelp file. This script is part of the CIAO Scripts Package.

Table of Contents

Caveats

Caveats

Problem with large files  (18 Sep 2012)

chandra_repro uncompresses files into memory to be written back out to disk. With large files, this can exhaust system resources and cause the script to fail with a non-informative error message 

Unable to read evt1 file
# chandra_repro (09 April 2012): ERROR read error

Workaround:

chandra_repro will use the uncompressed version of the file so the easiest work around it to gunzip the files before running chandra_repro 

unix% gunzip primary/*gz secondary/*gz

dsAPEPULSEHEIGHTERR -- WARNING: pulse height is less than split threshold when performing serial CTI adjustment.

The following warning may be displayed when running chandra_repro on an ACIS observation 

# acis_process_events (CIAO): The following error occurred 2 times:
    dsAPEPULSEHEIGHTERR -- WARNING: pulse height is less than split threshold when performing serial CTI adjustment.

As is discussed in the acis_process_events bug page, this warning can safely be ignored as long as the number of times printed is small compared to the total number of events.

/ ciao4.17 / bugs / chandra_repro.html