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Softly dripping tap
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XSPEC v11.3.2 Known Issues
Questions and comments to
xanprob@athena.gsfc.nasa.gov |
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Recompilation instructions. Most patches require
recompilation of XSPEC. Please follow the instructions below if necessary
| |
New Issues from XSPEC 11.3.2 | |
| All of the changes below [including the ones to which links to separate source code blocks are given] can be effected by downloading the latest patch tarfile, uncompressing it in the xanadu top source directory ($HEADAS/../ftools) and recompiling XSPEC. The patchfile also updates the version string [11.3.2aj at present]. The most recent bug was added on Nov 26, 2007. | |
| 11.3.2a | Reading type II pha files causes a seg
fault when running under Linux or Solaris. A workaround is to add
keywords XFLT0001, XFLT0002,...,XFLT0010 to the spectrum extension.
Our thanks to Craig Markwardt for pointing this out. Bug report added
on Apr 18, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/FILE/rdsfg2.f and rebuild xspec. |
| 11.3.2b | xspec 12.2 uses the fortran routine fgmodf
to return the standard directory location for files required by
models. However, xspec 11.3.2 uses fgdatd to perform the same
function. To make it easier to include local models in both versions a
routine fgmodf has been added to v11.3.2.
Our thanks to Roderick Johnstone for pointing out this inconsistency
Bug report added on Apr 18, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/fgunc.f and rebuild xspec. |
| 11.3.2c | The compps model seg faults under
Linux. Our thanks to Marek Gierlinski for reporting this.
Bug report added on Apr 19, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/comprefl.f and rebuild xspec. |
| 11.3.2d | The gaussian line model can generate a seg
fault if the part of the line falls below the first response energy.
Our thanks to John Houck for reporting this.
Bug report added on May 9, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/xsgaul.f and rebuild xspec. |
| 11.3.2e | The posm model calculates the function at
the upper boundary of the energy bin. A more accurate strategy is to
use a trapezoid integration over the bin. Our thanks to Chris Shrader
for the change.
Bug report added on May 23, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/xsposm.f and rebuild xspec. |
| 11.3.2f | The projct model seg faults when used with
more than 25 shells. Our thanks to Glenn Morris for reporting this.
Bug report added on Jun 3, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/projct.f and rebuild xspec. |
| 11.3.2g | The tclout simpars command occasionally seg
faults under some systems. Our thanks to Piero Ranalli for spotting this.
Bug report added on Jun 7, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/COMMAND/tclout.c and rebuild xspec. |
| 11.3.2h | The NEI models do not respond to the abund
command ie the relative abundances are always from Anders & Grevesse.
Our thanks to Terry Gaetz for reporting this.
Bug report added on Jun 9, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/neispec.f and rebuild xspec. |
| 11.3.2i | The APEC models can seg fault on some
systems. The fix also speeds up the model slighly in cases when it
doesn't seg fault. Bug report added on Jun 14, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/xsgaul.f and rebuild xspec. |
| 11.3.2j | There are a couple of bugs in the kerrbb
model. In the model definition file Mdd and Dbh are switched while in
the code rflag and lflag are swapped. Note that these bugs were fixed
at the end of Jan 05 in the version available on the new models page
but the fixes were not included in the new release due to an oversight.
Bug report added on Jun 28, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/kerrbb.f, $HEADAS/../ftools/spectral/xspec/src/local_mod/model.dat and rebuild xspec. |
| 11.3.2k | Machine round-off errors can produce large
discontinuous jumps in Cstat when model parameters are slowly varied,
particularly for data files with very few counts. (This is the same bug
fixed as 12.2.0bh.)
Bug report added on Jul 14, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/DATA/calcml.f, and rebuild xspec. |
| 11.3.2l | When using more than 15 datasets
simultaneously, datasets 16 and above are not plotted. This occurs
because PGPLOT only defines 15 colours. The fixed version cycles
through the colours. Our thanks to Steve Snowden for reporting this.
Bug report added on Jul 18, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/DATA/pltfld.f, and rebuild xspec. |
| 11.3.2m | The chain file is limited to 512 characters
in a line. Extended this to 2048 characters to allow more parameters
to be used. Our thanks to Jeremy Sanders for suggesting this.
Bug report added on Aug 11, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/MCMC/runchn.f, $HEADAS/../ftools/spectral/xspec/src/MCMC/mcfile.f, and rebuild xspec. |
| 11.3.2n | The log filename is limited to 80
characters. Using a longer filename causes seg faults. The allowed
length has been increased to 1024 characters. Our thanks to Jeremy
Sanders for reporting this. Bug report added on Aug 30, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/tcl/tcllog.c and rebuild xspec. |
| 11.3.2o | Using cstat with a background file on an
x86_64 produces a NaN for the fit statistic. Our thanks to Jeremy
Sanders for reporting this. Bug report added on Sep 14, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/DATA/calcml.f and rebuild xspec. |
| 11.3.2p | Type II spectral files no longer require a
CHANNEL column (which was inefficient if there were many rows). This
does mean that all channels in the spectrum must be included in the file
since if any are excluded there is no way of working out which ones
are left. Enhancement report added on Oct 22, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/FILE/rddtg1.f, $HEADAS/../ftools/spectral/xspec/src/FILE/rdgrpc.f, $HEADAS/../ftools/spectral/xspec/src/FILE/rdsfg2.f, and rebuild xspec. |
| 11.3.2q | A seg fault may occur if the table model
filename is left off in a model command. Our thanks to Ingo
Kreykenbohm for reporting this. Bug fix added on Dec 12, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/MODEL_COMP/mtchmd.f and $HEADAS/../ftools/spectral/xspec/src/MODEL_COMP/motble.f then rebuild xspec. |
| 11.3.2r | Several models may seg fault on x86_64
systems. Our thanks to Roderick Johnstone for reporting this. Bug fix
added on Dec 14, 2005.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/xsbexrav.f, $HEADAS/../ftools/spectral/xspec/src/functions/xspexrav.f, $HEADAS/../ftools/spectral/xspec/src/functions/xspexriv.f, $HEADAS/../ftools/spectral/xspec/src/functions/xsnteea.f then rebuild xspec. |
| 11.3.2s | In rare circumstances plots with the ratio
as the lower panel can produce garbage due to a floating point
overflow. Our thanks to Ryan Porter for reporting this. Bug fix added
on Mar 23, 2006.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/DATA/pltfld.f, then rebuild xspec. |
| 11.3.2t | When there are many counts/bin a spurious
warning message about non-Poisson data can be generated by the stat
cstat command. Our thanks to Glenn Morris for reporting this. Bug fix added
on Mar 28, 2006.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/DATA/ispoiss.f, then rebuild xspec. |
| 11.3.2u | Memory allocation errors in the tclout and
fakeit commands can cause seg faults on some systems. Our thanks to
Jeremy Sanders for the report and the fix. Bug fix added on Jul 24, 2006.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/DATA/fakeit.c and $HEADAS/../ftools/spectral/xspec/src/COMMAND/tclout.c, then rebuild xspec. |
| 11.3.2v | The second number produced by the tclout
compinfo command is wrong - it is one too few. Our thanks to Jeremy
Sanders for the report. Bug fix added on Jul 28, 2006.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/COMMAND/tclout.c then rebuild xspec. |
| 11.3.2w | The documentation on the lorentz model is
incorrect. The second parameter is the FWHM not the sigma. Our thanks
to Mariano Mendez for pointing this out.
The fix is to replace $HEADAS/../ftools/spectral/xspec/help/xspec.hlp then hmake install. |
| 11.3.2x | Changed the chatter level of the warning message
from tabulated models which occurs when the response energy range
extends outside the range tabulated for the model. Now only writes if
chatter is set to 15 or higher. Also fixes bug that caused the message
to be written when it should not have been. Our thanks to Jeremy Sanders for
reporting this. Bug fix added on Nov 7, 2006.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/inibin.f then rebuild xspec. |
| 11.3.2y | If the weight command is given before any
dataset is read in then it has no effect and requires that the next
invocation explicitly specify the dataset range else it too will have
no effect. Bug fix added on Nov 7, 2006.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/DATA/stwght.f then rebuild xspec. |
| 11.3.2z | Fakeit using an XMM RGS background file produced
by the rgsbkgmodel in SAS generates various obscure error
messages. Our thanks to Piero Ranalli for reporting this. Bug fix
added on Nov 8, 2006.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/DATA/wrtfak.f then rebuild xspec. |
| 11.3.2aa | The setplot id option generates garbage on
the plot. Our thanks to K.D. Kuntz for reporting this. Bug fix added
on Nov 28, 2006.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/PLOT/mklnid.f then rebuild xspec. |
| 11.3.2ab | The fit does not converge properly using
cstat for some datasets with low counts in the source and background.
Bug fix added on Jan 3, 2007.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/FIT/clcvec.f then rebuild xspec. |
| 11.3.2ac | The conversion constant relating keV and
Angstrom is incorrect in the 6th significant figure based on the
latest values of fundamental constants. Surprisingly this is visible
when plotting grating data in wavelength space. Our thanks to Carlos
Gabriel for reporting this. Bug fix added on Feb 13, 2007.
The fix is to get the latest patch tar file and rebuild xspec. |
| 11.3.2ad | The kerrbb model can generate a
segmentation fault when analyzing multiple datasets. Our thanks to
Diana Hannikainen for reporting this. Bug report added on Feb 26, 2007.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/kerrbb.f and rebuild xspec. |
| 11.3.2ae | The compps model can generate a
segmentation fault when using a response matrix with > 5000 energy
bins. Our thanks to Hiromitsu Takahashi for reporting this. Bug report
added on Mar 13, 2007.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/xscompps.f and rebuild xspec. |
| 11.3.2af | When using some particularly complicated
models you may see the error message "Too many blocks" following which
the fit will get lost. Our thanks to Ewan O'Sullivan and Roderick
Johnstone for independently reporting this. Bug report added on May 2, 2007.
The fix is to edit the file ftools/xanlib/memory/udmget.c and change the #define of MAXBLK from 100 to 1000. Ensuring this change is used in xspec is a little complex. First do an hmake and hmake install in ftools/xanlib. Next delete all copies of libxantcl* in your headas installation. Now go to xspec/src/tcl and do an hmake and hmake install. Finally go to xspec/src, delete the xspec11 executable and do an hmake and hmake install. Note that this fixed file is not included in the patch tar file. |
| 11.3.2ag | The compps model can generate a
segmentation fault when using a response matrix with < 88 energy
bins. Our thanks to Dirk Pandel for reporting this. Bug report
added on May 21, 2007.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/xscompps.f and rebuild xspec. |
| 11.3.2ah | If xspec has been compiled using gcc4 and
save makes an attempt to overwrite an existing file an error message
is generated instead of the usual prompt. Our thanks to Glenn Morris
for reporting this. Bug report added on Jul 18, 2007.
The fix is to replace $HEADAS/../ftools/xanlib/sysdep/sys.lnx and $HEADAS/../ftools/xanlib/sysdep/sys.darwin and rebuild the xanlib library and xspec (to do this do an hmake followed by hmake install in xanlib then an hmake and hmake install in xspec/src/tcl then finally an hmake and hmake install in xspec/src). |
| 11.3.2ai | The help for the NEI models incorrectly
state that abundance ratios are from Anders & Grevesse. In truth they
are those set using the abund command. Our thanks to Frank Haberl for
reporting this. Bug report added on Aug 28, 2007.
The fix is to replace $HEADAS/../ftools/spectral/xspec/help/xspec.hlp then hmake install. |
| 11.3.2aj | The gabs model is wrong and gives results
dependent on the energy bin size. Our thanks to Takao Kitaguchi for
spotting this. Bug report added on Nov 28, 2007.
The fix is to replace $HEADAS/../ftools/spectral/xspec/src/functions/xsgabs.f and rebuild xspec. |
Keith Arnaud, Lab. for High Energy Astrophysics, NASA/Goddard Space Flight Center.
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Last modified: Monday, 26-Nov-2007 11:30:03 EST