; FQCENTER ;--------------------------------------------------------------- ;! specifies that the frequency axis should be centered ;# ADVERB UV ;----------------------------------------------------------------------- ;; Copyright (C) 2014 ;; 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 ;----------------------------------------------------------------------- FQCENTER LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- FQCENTER Type: Adverb (Logical, > 0 => true) Use: If True, make the output frequency axis of a UV data set be referenced to the frequency channel Nchan/2 + 1 of IF 1. If False, leave the frequency reference pixel unchanged, or change it to pixel 1.0. Null Value: true (1) Tasks: Many tasks which copy data have this option. A frequency reference change requires both a simple change in the UV data set header and a scaling of the U,V,W values of each sample by the ratio of the new to old reference frequencies. ----------------------------------------------------------------