To: Visiting Committee From: Eric Greisen Date: 4 February 1995 Subject: Annual Report on Classic AIPS (last year's was on 1 April) There were two releases of Classic AIPS during the past year. The 15JUL94 release was shipped to 87 institutions (42 on 4 kinds of magnetic tape, 45 electronically). The increase in magnetic tapes over network transmissions is due to the availability of a full binary distribution, which was restricted to magnetic tape for 15JUL94. 36 sites took advantage of the full binary form of AIPS. The 15JAN95 release has just begun shipment. The binary form will be available electronically this time. Two institutions, CIT and CfA, continue to subscribe to the release that is under active development. As has been done for Socorro for years, their copies of AIPS are updated automatically and electronically on nearly a daily basis. During the year, AIPS was ported to one new operating system, Silicon Graphics' version of Unix. The ports to DEC's OSF/1 and to the Linux system used on PCs were improved, particularly in the area of magnetic tapes. There has been no change in the personnel in the Classic AIPS Group during the past year. Phil Diamond was supposed to transfer most of his effort to the AIPS++ Group in early 1995. That now appears delayed. A large amount of new or improved software was added to AIPS during the year. Major areas of concern were (1) reading VLBA Correlator data, correcting for correlator "features", (2) VLBI data processing, including fringe fitting, spectral-line polarization calibration, amplitude and bandpass calibration and fringe-rate mapping, (3) single-dish data processing, especially imaging from 12m on-the-fly observations, and (4) automatic source finding and fitting. The major job of re-writing the AIPS CookBook was begun, with introductory, calibration, display, spectral-line, VLBI, and site-specific chapters completed. Anyone who is interested in the details may consult NRAO's Quarterly Reports and/or the AIPSLetter which is issued with each release. Much documentation on AIPS is available on the World-Wide Web at URL http://info.cv.nrao.edu/aips/aips-home.html. AIPS Quarterly and annual reports, the AIPS Memo Series, AIPSLetters, CookBook chapters, FAQs, software patches for recent releases, and even all current help files are available from this URL.