; FQTOL ;--------------------------------------------------------------- ;! Frequency tolerance with which FQ entries are accepted. ;# ADVERB CALIBRATION ;----------------------------------------------------------------------- ;; 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 ;----------------------------------------------------------------------- ;--------------------------------------------------------------- FQTOL LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- FQTOL Type: Adverb (Scalar) Use: Standard data selection adverb, used to define a frequency tolerance within which data with different frequencies are assigned the same FQ number. Is mainly used when merging uv data files together. Example: if file A has freq #1 and file B has freq #2 then they will be given the same FQ number if (freq #1 + FQTOL) < freq #2 > (freq #1 + FQTOL). Null Value: -1 A null value means set FQTOL to be the maximum frequency difference a source can have in one day, i.e. FQTOL = ref. freq * (30 km/s) / (30000 km/s) ----------------------------------------------------------------