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Frequently Asked Questions
Answers to common CIAO questions, including explanation of
often-seen warnings and error messages.
Data Products
- When was my observation performed?
When was the file created?
What version of data processing was used?
- What does the CREATOR header keyword mean?
- What was the aimpoint of the observation?
- What ACIS gain file was used in the automatic processing?
- What is the focal plane temperature for my observation?
- Why are there sometimes multiple asol1.fits files for
my observation?
How do I treat these in my analysis?
- Why do the HRC-S threads filter out the final PHA
channel (e.g. "pha=0:254")?
Parameter Files
-
Why does the tool does not execute when I get the
following error(s)?
pget: parameter not found...
parammatch : can't find parameter PARAMNAME in reference list
parameter error?
- Why should I delete my parameter files after
upgrading CIAO?
- How do I run multiple instances of a CIAO tool
without clobbering the parameter file?
- The tool is failing because ")sval" has
somehow shown up in the parameter value.
Data Model
-
How do I change the MEM parameter when I get this
error?
# DMCOPY (CIAO 3.4): WARNING: Creating large image: 134 MB. Current max set at 50 MB.
Increase maximum using [opt mem=n] or increase blocking to reduce size.
- How can I define a region around a single chip?
- Why should I filter on sky coordinates rather than the CCD_ID column?
ARDLIB
-
Why am I getting an ARDLIB error about a bad pixel
file from a different ObsID?
***ARDLIB error: Unable to find data file acisf01842_000N001_bpix1.fits[BADPIX7]
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What does this warning mean?
***ARDLIB warning: Filename some_file.fits does not specify an extension.
Assuming the first "interesting" extension.
- How can I tell CIAO to use a different HRMA effective
area file?
Computer Environment
- What is a shell?
What shell am I using?
- Why is the background of my smongo x11 window is
changed to black if CIAO is running?
Miscellaneous
- Which CALDB version is installed on my system?
- What is the limiting file size for CIAO?
- What is the maximum size region file that CIAO can process?
ChIPS
-
How can I get better precision in ChIPS
output?
chips> 227.49334262014-0.0001363
227.493
ds9
- Can I use a newer version of ds9 than the one
packaged with CIAO?
- How do I build polygon regions in ds9?
- How do I rotate a region in ds9?
- How do I display a source list on my data?
Filtwin
-
Why am I getting the following error when I try
to launch filtwin?
FilterWindow has already been instantiated for this session.
Prism
-
Why am I getting the following repeated errors when
launching prism?
Warning: Cannot allocate colormap entry for "snow"
Warning: Cannot allocate colormap entry for "cyan4"
Warning: Type conversion failed
acis_process_events
- Why hasn't the CALDBVER keyword been updated
after I run this tool?
- Why is my level 2 event file larger than the one from
the pipeline?
-
What does this warning mean?
# acis_process_events (CIAO 3.4): The following error occurred 26941 times:
dsAFEBADPCNTERR -- WARNING: Event island contains 1 or more bad pixels.
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What does this warning mean?
# acis_process_events (CIAO 3.4): WARNING: No files found matching
CALDB search:
tel=CHANDRA
inst=ACIS
det=-
filt=-
product=CTI
start_date=1999-08-20T00:07:44
start_time=00:07:44
stop_date=1999-08-20T02:26:38
stop_time=02:26:38
query=-
# acis_process_events (CIAO 3.4): WARNING: PROBLEM READING CTIFILE, CTI
ADJUSTMENT WILL NOT BE APPLIED.
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What does this warning mean?
# acis_process_events (CIAO 3.4): The following error occurred 31 times:
WARNING: pulse height is less than split threshold when performing serial CTI adjustment.
dmcopy
- How can I specify the datatype of the output image?
dmextract
- How do I extract many spectra with one command?
-
Why do I get a parse error with this region file?
# Region file format: CIAO version 1.0
-rotbox(4055.375,4165.5674,4.6747966,4.4715447,63.400002)
annulus(4059.5601,4163.4399,2.0325203,7.113821)
- Why does dmextract convert arcseconds to arcminutes when I use pset?
dmstat
- How can I calculate the centroid of counts in a region?
dmtcalc
- Why is the column moved to the end of the table when
I try to update it in place?
hrc_process_events
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What does this warning mean?
# hrc_process_events (CIAO 3.4): The following error occurred 2482 times:
dsHPEEVENTSEQERR -- WARNING: Out of sequence events discovered in hrc_evt1.fits.
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What does this warning mean?
# hrc_process_events (CIAO 3.4): The following error occurred 224 times:
WARNING: can't find a proper degap value for this raw coord. in hrc_evt1.fits.
mkacisrmf
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Since none of the files that are passed to
mkacisrmf are aware of the date of my
observation, how is the time-dependent gain included in
the RMF?
mkexpmap
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What does this warning mean?
*** Warning: CYCLE not found or invalid in /tmp/imap_3.fits --- assuming 'P'
mkgarf
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What does this warning mean?
*** WARNING: The ARF was computed to be zero at all the specified energies.
This is probably due to an incorrect source position
mkwarf
-
What does this warning mean?
Couldn't determine chip position for pixel: (1013.000000,0.000000)
with value=1.000000. Skipping pixel
tg_create_mask
- What if the extraction regions extend beyond the detector edge?
tg_resolve_events
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What does this warning mean?
# tg_resolve_events (CIAO 3.4): The following error occurred 38950 times:
WARNING: Event chip position is outside of valid range.
Grating coordinates not computed for this event.
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What does this warning mean?
# tg_resolve_events (CIAO 3.4): The following error occurred 10000 times:
dsTREUNKNOWNINCOLERR -- WARNING: Not loading data from
unrecognized level 1.5 input column.
S-Lang scripts
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Why can't CIAO find my S-Lang scripts?
sherpa> () = evalfile("lc_clean.sl")
Error: cannot find or unable to open file as requested : lc_clean.sl
- My script worked in CIAO 2.3. Why won't it work in
CIAO 3?
fullgarf
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Why do I get the following error?
*** ERROR: aspect histogram acisf00459_ah4.fits[ASPHIST] contains no rows
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Why do I get the following warnings?
WARNING: OSIP file contains invalid data for the region
512<=CHIPX<=768 608<=CHIPY<=640 at 0.1 keV.
WARNING: OSIP file contains invalid data for the region
512<=CHIPX<=768 608<=CHIPY<=640 at 0.277 keV.
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