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Matching CIAO and CALDB VersionsCIAO 4.0 requires CALDB 3.4.0 or higher to operate properly. Are your versions mismatched? Time to update CIAO and CALDB! Source Detection and Cosmic-Ray AfterglowsCIAO users who are trying to detect sources of about 10 counts or less should be aware of potential confusion with cosmic-ray afterglows that have not been removed from the data. The Cosmic-Ray Afterglows why topic explains the limitations of the current tools and describes analysis tips to help eliminate more of the afterglows. 07 May 2008 Information about installing CIAO on unsupported platforms has been added to the Platforms webpage 16 Apr 2008 CIAO has been patched to CIAO 4.0.2. The CIAO 4.0.2 patch enables CIAO to run on Mac OS X 10.5 (Leopard) Intel. The patch is optional for 10.4 (Tiger) Intel machines. The patch should not be applied to Linux, Solaris, or Mac PowerPC installations of CIAO. Additionally, there is an updated standalone version of ObsVis for Mac OS X Intel; see the ObsVis website for details and the download. 16 Apr 2008 Mac OS X platforms: FITS table file writing slowness with NFS-mounted disks. FITS table file writing through the CXC Data Model slows by a significant factor on Mac OS X machines - both 10.4 (Tiger) and 10.5 (Leopard) - when the data is accessed via a networked file system (NFS) mount. This issue does not affect Solaris or Linux platforms. |
Ahelp for CIAO 4.0To learn how to use the help system for CIAO (ahelp), say: unix% ahelp The help documents are accessed by subject (a single word, case insensitive), so to get help on the tool dmextract try unix% ahelp dmextract and to search on a word use about (it is an alias to ahelp -k) which will bring up a list of all matching documents or - if there is only one match - display that document. Here we look for any document on "stacks":
unix% about stacks
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| SUBJECT | CONTEXT | SYNOPSIS |
|--------------|---------|-----------------------------------------------------|
| parameter | concept | Describes the parameter interface used by CIAO. |
|--------------|---------|-----------------------------------------------------|
| stack | concept | How to set a parameter to more than one value |
| | | using a stack. |
|--------------|---------|-----------------------------------------------------|
| stk_build | tools | stk_build is used to build a stack from a |
| | | user-defined string. The output is to stdout, |
| | | stderr, or a file. |
|--------------|---------|-----------------------------------------------------|
| stk_count | tools | stk_count is used to count the number of items in |
| | | a stack. The output is to the stk_count parameter |
| | | file. |
|--------------|---------|-----------------------------------------------------|
| stk_read_num | tools | stk_read_num is used to read one element of a |
| | | user-defined stack. The output is to the |
| | | outelement field of the stk_read_num parameter |
| | | file. |
|--------------|---------|-----------------------------------------------------|
| stk_where | tools | stk_where finds the location of an item in a stack |
--------------------------------------------------------------------------------
Use "ahelp subject" ("ahelp context subject" for non-unique cases) e.g.:
ahelp stk_where
ahelp tools stk_where
In general you will be now be able to say "ahelp <subject>" to read the help for that document. However, if the same subject matches different contexts, you have to say "ahelp <context> <subject>" as described at the end of the list of matches ("ahelp tools stk_where"). Read the ahelp document for more information on the ahelp system, such as reading parts of the document - e.g. only the examples or the parameter list. |
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The Chandra X-Ray
Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA. Email: cxcweb@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2004. All rights reserved. |
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