|Patches to 15OCT98|
This page most recently updated on $Date: 2001/12/28 20:50:45 $ (UT)
You will find patches to known bugs in 15OCT98 here.
The following is a list of pointers to the different patches in this document.
The remainder of this document is comprised of the patch descriptions pointed to by the above references.
TCD000000;file did not get transferred. For this release of AIPS, there is no
TCD000000;file; instead there is a
TCD000001;file which almost certainly did get downloaded if you allowed
INSTEP1to get the binaries for you.
INSTEP1when it claims not everything got downloaded, and start it again. It will now think a binary version is present. If you have not yet begun
INSTEP1, you can replace the
FTPGETfile as follows:
Gridded Clean-component modeling
sqrt (1 - xshift**2 - yshift**2)) was supposed to be scaled by the ratio of the frequency of the first spectral (or IF) channel in the model subtraction to the reference frequency. This scaling factor was omitted from the code, apparently forever or at least since 1990. The bug can be important. In a test case, with data at declination -26, a strong interfering source 1 degree north of the phase center, and a frequency difference of 20%, the Clean in IMAGR was quickly divergent. Note that this test involves a large frequency difference, a largish separation, and a declination and direction of separation that emphasize the W * Z term. There was no error when the frequency of the first channel/IF was the reference frequency. This is usually the case in multi-IF bandwidth synthesis with BIF = 1. In spectral-line, single-channel synthesis the frequency differences are normally very small. And, at more northerly declinations or field separations with horizontal parts of the vector, the W * Z term is less important. Perhaps this is why this error was not reported and found until now.
$QNOT) on your system.
COMRPL $QNOT/ALGSTB $QNOT/ALGSUB
Appending to very large files
$APLSUB) on your system.
COMLNKother uv tasks if they are to read large files beginning more than 2 Gigabytes from the beginning.
$APGNOT) on your system.