; CORFQ ;--------------------------------------------------------------- ;! corrects uvw for incorrect observing frequency ;# Task UV ;----------------------------------------------------------------------- ;; Copyright (C) 1995 ;; Associated Universities, Inc. Washington DC, USA. ;; ;; This program is free software; you can redistribute it and/or ;; modify it under the terms of the GNU General Public License as ;; published by the Free Software Foundation; either version 2 of ;; the License, or (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public ;; License along with this program; if not, write to the Free ;; Software Foundation, Inc., 675 Massachusetts Ave, Cambridge, ;; MA 02139, USA. ;; ;; Correspondence concerning AIPS should be addressed as follows: ;; Internet email: aipsmail@nrao.edu. ;; Postal address: AIPS Project Office ;; National Radio Astronomy Observatory ;; 520 Edgemont Road ;; Charlottesville, VA 22903-2475 USA ;----------------------------------------------------------------------- ;--------------------------------------------------------------- CORFQ LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC CORFQ: Task to correct uvw for an incorrect obs. frequency. USERID User number. 0 => login user, 32000 => any user. INNAME UV data (name). INCLASS UV data (class). INSEQ 0.0 9999.0 UV data (seq. #). 0 => high INDISK 0.0 9.0 Disk unit #. 0 => any FACTOR Correction factor, if 0.0 then the 2cm (1981) problem is corrected.(see HELP CORFQ) ---------------------------------------------------------------- CORFQ Type: Task Use: This task corrects for an incorrect observing frequency used in a data base. It corrects frequency and uvw. Adverbs: USERID.....User number. 0 => login user, 32000 => any. INNAME.....UV file name (name). Standard defaults. INCLASS....UV file name (class). Standard defaults. INSEQ......UV file name (seq. #). 0 => highest. INDISK.....Disk unit #. 0 => any. FACTOR.....Correction factor for frequency and uvw. 0.0 => FACTOR = (FREQ - BANDWID) / FREQ ---------------------------------------------------------------- CORFQ: Task to correct uvw for an incorrect obs. frequency. DOCUMENTOR: C.P. O'Dea NRAO/VLA RELATED PROGRAMS: IMHEADER, UVCOP PURPOSE CORFQ corrects the frequency in the header and the uvw in a uv data base (units are in wavelengths) by multiplying these quantities by FACTOR. The corrections are applied in situ, ie., a new data base is not created. COMMENTS FACTOR: FACTOR should be chosen such that: FACTOR = (correct frequency)/(current frequency). The default of 0 gives: FACTOR = (freq - bandwidth)/freq. This corrects a past problem at 2cm where the frequency used was too large by the bandwidth.