Astronomical Image Processing System
NRAO has instituted a "helpdesk" system
similar to those at other astronomical institutions. AIPS will
participate in this effort which is intended to avoid having
problems fall between the cracks. The helpdesk is accessed via
that the help site will forward you to my.nrao to create a login
if you do not already have one and the my.nrao site will then
offer a tab to reach the helpdesk. The system for the AIPS
"department" will make use of the firstname.lastname@example.org list manager
system that we have used for years. Thus, unlike the rest of the
NRAO helpdesk, messages to the AIPS portion will be made public in
the daip archive. This archive is accessible via the web and is
well known to Google among other things. Please switch to the new
helpdesk to allow more systematic handling of your AIPS queries
and bug reports.
The development version 31DEC14 is
available, the previous development version 31DEC13 is slushy,
and the old frozen version 31DEC12 will soon be unavailable for
installation. (A MNJ on 31DEC12, if it has
not been run since October 24, 2013, might still be useful.) The
new cvs form of the Midnight Job has been very easy to use and
effective in keeping numerous sites up to date. In 2014, the MNJ
will work sometimes on 31DEC13 if there has been a released patch.
The 31DEC14 and 31DEC13 releases are also available as binary
installations (and MNJs).
TeK and message server problems
Users have encountered problems getting
the TeK and message servers to work in binary installations.
These servers are programs which run in an xterm and that xterm
must come up with some knowledge of AIPS libraries. This requires
users to modify their login scripts (e.g. .cshrc file for c shell,
.bashrc file for bash). See
Linux compiler troubles
There appear to be problems with many of the versions of the
gcc/g77 compiler suite. GNU compiler versions known not to work
with AIPS include 2.96, 3.0.3, 3.0.4, and 3.3.x. Versions 3.2.2
and 3.4.3 and 3.4.4 are known to work. The new 4.0.x and 4.1.x
are thought not to work with AIPS, but 4.2.1 (gfortran) appears to
be okay. See the compiler installation notes for general
instructions on installing GNU compilers.
Also, see the Users'
FAQ: answers to Frequently Asked Questions, the
AIPS Managers' FAQ:
answers to AIPS Managers (and installers) Frequent Questions; and our
page on who is in the AIPS
group. The AIPS Manager FAQ page is
especially helpful if you are having trouble getting the AIPS TV to
run properly or are encountering other general difficulties or wish to
configure new machines and disks in your AIPS environment.
is the new primary development version of AIPS. It is ready
for installation. The 6-month progress report on 31DEC14 is
available as 31DEC14
AIPSLetter dated 30 June 2014 (PS, 765430 bytes).
It is also available gzipped,
(329413 bytes) and PDF,
is no longer primary development version of AIPS and will be
frozen in 2014 except for bug patches. It is available for
installation. The final report on 31DEC13
is available as 31DEC13
AIPSLetter dated 31 December 2013 (PS, 913097 bytes).
It is also available gzipped,
(396159 bytes) and PDF,
(196866 bytes). The 6-month progress report on 31DEC13 is available as 31DEC13
AIPSLetter dated 30 June 2013 (PS, 3301312 bytes).
It is also available gzipped,
(453027 bytes) and PDF,
is no longer available for installation. It will not be patched
even for egregious errors. The final report on 31DEC12 is
available as 31DEC12
AIPSLetter dated 30 December 2012 (PS, 919456 bytes).
It is also available gzipped,
(399961 bytes) and PDF,
(210575 bytes). The 6-month progress report on 31DEC12 is available as 31DEC12
AIPSLetter dated 30 June 2012 (PS, 892100 bytes).
It is also available gzipped,
(389974 bytes) and PDF,
- 31DEC06 and later releases contain a port to
the MacIntosh OS/X system running on Intel cpus. This includes
a full binary installation produced with Intel's compiler. An
AIPSMark of 150 was obtained on our iMac which will be used to
support this "new" architecture.
- Since the end of January 2009, Linux systems
running on 64-bit hardware with 64-bit operating systems have
the choice of using LNX64 rather than LINUX as their AIPS
architecture. The binary version for LNX64 is compiled with a
recent 64-bit Intel compiler and runs somewhat faster than the
LINUX version run on the same machines.
- Since September 1, 2005 the binary versions
for Linux are compiled with the Intel compiler version 9.0.
They are compiled and linked with options that make the load
modules rather large but allow them to run as well as possible
on the latest threaded Pentium IVs, older Pentium IVs, and on
general machines such as AMDs. Since November 30, 2004, binary
installations for MacIntosh OS/X (IBM xlf compiler), Solaris Ultra
(SUN compiler), and Linux (Intel 9.0) have been available. They
are on the 31DEC05 and later versions. At present, all versions
provide considerable advantages over systems done with free
- If you own a MacIntosh OS X computer, you
may now run AIPS. Get either of the above versions; all contain
the new MACPPC and MACINT ports. Note that the somewhat
expensive IBM and Intel compilers produce code which runs about
50% faster than the code produced by the GNU compiler. Binaries
compiled with the IBM and Intel compilers may be installed and
updated from our ftp site. That site is maintained by our Mac
computers in Socorro. Read also the special Mac installation instructions which are
supplements to the A Guide to the
Install Wizard instructions.
- When you get
the new install wizard; we have a good on-line guide that will help you
through it. Read it!
- The 15OCT99, 31DEC00, 31DEC01, 31DEC02, 31DEC03 31DEC04 31DEC05 31DEC06 31DEC07 31DEC08 31DEC09 31DEC10 and 31DEC11 releases of AIPS
are no longer available; the number of bug fixes and differences
between them and the
31DEC14 version have become too
great. The continued significant demand for a frozen, even if
obsolete, version was the main reason we decided to resume
There are sometimes considerations which users of older versions of
AIPS must take into account due to changes in the latest version. In
addition, there are sometimes bugs introduced into the latest version
which then get repaired in that version. Such matters may affect
those users who keep their AIPS up to date. These bugs often do not
get reported in the AIPSLetter since they were temporary but might be
of concern for diligent users. They are reported in
but those reports are sometimes fragmentary and confusing. We have
begun a new web page for problems of this
sort. It is hoped that we will keep it up to date.
You really should be getting 31DEC13 or 31DEC14 instead of patching an older version!
With previous releases, we did not change the
frozen release tar ball; user sites were required to download the text
files and do any compilations themselves. But, beginning with
31DEC04, we provide binary releases for which user sites are not
required to have compilers. Therefore, we have reversed our policy.
These patches have been applied to the official code of 31DEC11 and
may be downloaded using a 31DEC11 "Midnight Job". Any tarball taken
after the change date listed below will already have the patches
applied. Of course, you may still download and compile the files as
There are twenty-one patches for 31DEC13.
There are three large and nineteen more
normal 31DEC12 patches.
- Spectral index was not corrected when
BPASS even when there was only one calibration
LISTR failed to read source information when
printing "gains". 2014-01-14
DOOSRO run file had a typo in its first line
UVFND used the real part of channel-averaged data
for both real and imaginary parts 2014-02-07
DOBAND 2 and 4 modes had an initialization issue
DOOSRO pipeline procedure contained a POPS error
PCNTR had minor issues which
blocked display of true-color images.
PCCOR did not handle blanked values from the PC
table cable-cal measurements
FITLD had trouble finding the correct records for
DSKEW did bad things when the input image had a
non-zero value of rotation. 2014-03-17
CLCAL failed to re-reference the SN tables
when requested. 2014-03-19
SNP2D needed clarification of
BIF and to write reference channel phases as
well as delays. 2014-03-27
TIORD had a bad format.
RMFIT called the function
routine incorrectly numerous times, mostly with remarkably
benign results. 2014-04-02
PRTAB could abort when string data was very long.
LISTR did not show the correct scaling for angles
GAIN listing. 2014-04-11
SPFLG interpreted flagged
rows in the flag command table as a serious error in a couple
of places. 2014-05-29
DTSUM omitted the highest numbered antenna from
its matrix list if it did not have autocorrelation records.
CALIB in phase-only solutions could return
amplitude gains other than 1.0 when only 2 baselines occurred
in an interval. 2014-06-27
PCAL did not take data flagging into account when
averaging data over time. 2014-08-08
TYSMO did not apply flagging correctly except if
all flags applied to all Stokes. 2014-08-21
There are ten 31DEC11 patches.
- Bandpass calibration was not applied to enough channels to
support post-BP frequency smoothing 2013-01-16
- Tick increments were computed with an erroneous round-off
parameters leading some tick marks to be plotted at offset
POSSM had a number of minor irritating bugs.
FITLD turned off DIGICOR corrections if the array
name is not VLBA. 2013-02-05
FITLD after above correction failed if it could
not make a
CQ table. 2013-02-18
CL2HF aborted because of an internal name conflict
PRTAB aborted when writing large values with F
COMB did not do POLC correctly when using constant
noise values 2013-04-04
AFARS had an addressing bug causing it to try to
write too much 2013-04-05
FITLD could get the
EQUINOX wrong in
SU table with FITS-IDI input
COMB messed up scaling when combining two images
with one of them not
FITLD had a warning message with more arguments
than format items 2013-05-21
BPASS rounded times outward for each scan by too
IMAGR computed the actual average frequency
JMFIT could return negative
error bars when the object was negative
TRANS messed up reversing the order of axes
greater than one while swapping the same axis
PRTAB had formatting issues with large tables,
magic blanks 2013-07-25
SU table access was incorrect in some routines
including widely used ones 2013-07-29
SPFLG had a gridding counter which could overflow
with modern data sets 2013-08-16
PRTAB had formatting issues with required E
formats in F-format modes 2013-08-23
CVEL were affected by a bad
variable in setting the Doppler velocity and the former omitted
the system velocity when setting source velocities.
ISPEC on an image with an
could fail 2013-10-24
There are eighteen 31DEC10 patches already:
- Imaging code had problems with very large gridded modeling.
UVFIT had many areas of code dimensioned too small
to handle the new allowed number of components.
FARS did not convert residuals to amplitude and
phase properly when being output and did not shift back to the
input lambda**2 properly. History file had error.
AFARS did not handle
correctly, producing wrong rotation measure images. Code was
added to prevent quadratic fits too close to edges.
SQASH had a format error in the history writing
that caused aborts. 2012-01-16
FITAB did not write the
that is really required with compressed visibility data.
CLCOR did not correct for the GMRT's opposite phase
sign convention. 2012-01-16
VLANT did not correct EVLA data properly.
SCIMG did not apply the flag
table to the data entering the self-cal
- Mac OS/X version Mountain Lion changed ps to issue an error
message when there is a library path; procedures needed
defenses against this. 2012-11-19
UVCOP ignored the last 4 characters of SOURCE
making sources with long names inaccesible when selecting by
DBCON was vulnerable to errors in table headers
causing it to attempt semi-infinite file expansions.
FRING had an error when attempting exhaustive
searches causing it to find wrong answers for all except the
first IF 2011-01-21
- Object oriented uv tasks had a chance to find the wrong output
file when a file of the same name and higher sequence number
was on the same disk.2011-01-21
CALIB failed to build the output header correctly
for non-standard single-source data sets
RLDIF did not handle the one-source continuum
corrections properly 2011-01-24
SWAPR ignored autocorrelation data.
SNPLT did not check phase range in plotting PC
table phases. 2011-03-23
IMAGR did not average multi-channel data correctly
when doing on-the-fly baseline-length timae averaging
NX tables were written incorrectly when there were
multiple subarrays. 2011-04-15
IMEAN did not write the text file output correctly.
NOIFS did not scale the UVW's correctly, normally
being half an IF off 2011-06-14
CVEL did not die when it should on fatal errors
FITLD and friends did not read table header
character-valued keywords correctly
UVCOP did not apply flags when SOURCES was
IMAGR did not keep the correct Clean beams for
facets other than one when making an image cube with
ONEBEAM true. 2011-07-25
VPLOT did not plot models correctly for more
than 64 facets. 2011-07-29
CLCOR used the wrong sign of the antenna Y position
than 64 facets. 2011-08-04
With the advent of the binary versions of AIPS, it has become more
difficult to compile special local tasks. If one wants to do this and
also take advantage of the improved performance of the NRAO-purchased
compilers (Intel for LINUX, LNX64, and MACINT; IBM for MACPPC; SUN for
Solaris), the user must purchase the compiler(s) for himself. This
can be rather expensive. There are two ways out of this bind. If the
local task is of sufficient interest, you could try to pursuade the
AIPS group to include it in the general AIPS distribution. This
requires the code to be written up to a least some minimal standard.
A recent example is
ATLOD which translates older Autralia
Telescope data into AIPS. The alternative is to send the code and
help file to the AIPS group and ask them to compile to routines,
leaving the results on the AIPS ftp site. This has now been done for
ORFIT in a CfA directory
CALIV in a WSRT directory.
Both of these site directories are located in a
directory at the main AIPS public ftp site.
The load modules are stored under the name
.EXE.arch to identify the operating
system (arch) to which the load module corresponds. To
install them in your system, copy the help file
$TST/HELP/ and copy
the appropriate load module to
that one has to rename the load module dropping the architecture
string. For LNX64 machines two load modules are provided, one
compiled with the gnu compiler and one with the intel compiler. In
general, for a binary installation, you will want the intel version.
... will be of interest to you if you want the latest
31DEC07 versions updated nightly,
weekly, or occasionally. It can do either text or binary updates
depending on which sort you did with install.pl.
The WENSS/WISH files have been corrected (2 July 2004) to omit the
sources which are the sum of other "components" also appearing in the
lists. Note that the survey files shipped with AIPS releases include
the shorter lists of the stronger sources. The full lists are only
available from this ftp site.
AIPS Memos, Reports, old AIPSLetters, the Cookbook, Going
AIPS, access to the newest versions of the
CHANGE.DOC and more. The most recent AIPS Memos
- number 118,
discussing the usage of XGAUS, ZEMAN, and RMFIT spectral modeling tasks
- number 117,
discussing the detailed FITS format used by AIPS, revision dated August 28 2012,
- number 116,
discussing new RFI mitigation options in AIPS, dated June 2010,
- number 115,
discussing new auto-boxing for Clean capabilites in AIPS, dated June 29, 2009,
- number 114,
re-stating the FITS-IDI convention with corrections and added
tables, revised December 15, 2009,
- number 113,
discussing a "new" geometric way to handle the W problem, dated May 22, 2009,
- number 112,
discussing the AIPS pipeline for VLA data reduction, dated March
- number 111,
discussing phase referencing with more than one calibrator using
ATMCA, dated January 6, 2005,
- number 110,
discussing strategy for removing troposppheric and clock errors
using DELZN, revised October 21, 2009, dated August 31, 2004,
- number 109,
discussing AIPS on DVDs and read-only data systems, dated
January 20, 2004,
- number 108,
discussing weights for VLA data, dated January 21, 2003,
- number 107,
discussing the differences between FRING and KRING, dated April
- number 106,
discussing the Brandeis scheme for making movies in AIPS dated
June 6, 2001,
- number 105,
discussing the new RUN file to simplify VLBA data reduction
dated February 28, 2001 and April 26, 2001,
- number 104,
discussing the new Y2K performance test dated September 8, 2000, and
- number 103,
discussing data weighting in AIPS dated 2000-03-21.
The AIPS group maintains three e-mail exploder lists. The first,
called daip, is restricted to immediate members of the AIPS group and
a few NRAO scientist advisors. The other two are, however, open to
any suitable person. Membership is moderated, of course, because SPAM
has become so annoying.
The group intended for discussion of AIPS issues is called
bananas and is used, among other things, to announce patches
to the "frozen" versions of AIPS. Traffic is light. You can subscribe
yourself to this list on-line.
The group intended for discussion of problems related to the
"Midnight Job" is called mnj and is used to announce AIPS
Manager things related to the current MNJ. Traffic is light, but the
announcements can have a serious impact on any site attempting to stay
current with the development version of AIPS. You can subscribe
yourself to this list on-line.
The FITS Interferometry Data Interchange
format is a set of FITS
binary table definitions and a set of conventions for using them to
transport radio interferometry data between different software
The FITS Interferometry Data Interchange Convention (formerly Format)
has been accepted as an IAU-acknowledged convention. This convention
was documented by Chris Flatters in AIPS
Memo 102 which, unfortunately, was not accompanied by an editable
text version. Therefore, Eric Greisen had to re-type the document.
While doing so, he updated some matters, corrected minor wording
issues, and added 5 new sections for 5 new tables, 3 of which are
actually in use. Interested parties should review AIPS
Memo 114 revised (ps) or AIPS
Memo 114 revised (pdf); it has been submitted to the IAU FITS
Committee. Greisen has attempted to highlight the changed parts in
red in this draft. The current draft is dated August 2011 and
includes the MODEL_COMPS table and comments from Lorant
Sjowerman, Bill Cotton, and others. Please e-mail
email@example.com with comments.
Help for the weary AIPS Installer. Very much experimental and
incomplete, and probably needs updating, but better than nothing.
The AIPS Benchmark was known as the "DDT" (Dirty
Dozen Tasks); we have results for a variety of systems. A more modern
test called "Y2K" has been developed in 2000 to test faster
computers and to use IMAGR rather than MX. For 31DEC04 we have new master images and data sets. In
addition, we have a new HUGE test using multi-resolution IMAGR on
Cygnus A. Changes to CALIB and VTESS in particular
forced this update, while faster computers make Y2K LARGE run in as
little as 5 minutes.
The former designated-AIP-of-the-week program; rotation has been
halted due to the lack of personnel. The e-mail address
firstname.lastname@example.org) was the best method of reaching all
the members of the AIPS Group and will still work. However, we ask
you to use the new NRAO-wide helpdesk instead. Go to
and login with your my.nrao.edu username and password. There you may
peruse the "knowledge base" (currently empty), enter new tickets in
any of several departments including AIPS, and review and update any
tickets you have submitted.
AIPS is copyrighted by Associated Universities, Inc. using the GNU
copright form. The full text is available with every AIPS release and
may be read here.
This is the Flexible Image Transport System, and is the
standard data interchange format used by most Astronomical Software,
including AIPS. Follow the above reference for a very extensive
set of documentataion, including a large resource list for Astronomy on
The primary AIPS address is the
referenced on our main Contact page, and general
queries, requests for distribution tapes, documents, ftp access, and so on
should be directed there. Application-oriented questions should be
directed to the Designated AIP.
Modified on $Date: 2014/08/21 19:55:31 $
Eric W. Greisen