; ICHANSEL ;--------------------------------------------------------------- ;! Array of start, stop, increment channel #S + IF to average ;# ADVERB CALIBRATION SPECTRAL ;----------------------------------------------------------------------- ;; Copyright (C) 2000 ;; 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 ;----------------------------------------------------------------------- ICHANSEL LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- ICHANSEL Type: Adverb (REAL, 4 elements x 20 rows) Use: Data selection adverb used to specify a list of start and stop channel numbers plus an increment AND IF NUMBER to be used in some way, such as to be averaged to form a pseudo-continuum channel. Up to 20 sets of channel numbers/IFs can be specified. The first two elements specify the start and stop channel numbers, the third specifies the increment within that range, i.e.if CHANSEL = 10,20,2 that means take every other channel in the range 10 - 20, so that channels 10,12,14,16,18,20 would be averaged together. The fourth element specifies the IF to which the previous three apply. Null Value: 0 A completely null value means use all channels in some tasks: ICHANSEL(1,i) <= 0 => 1 ICHANSEL(2,1) <= 0 => Nchan ICHANSEL(2,i) <= 0 => (i > 1) -> no more channel sets ICHANSEL(3,i) <= 0 => 1 ICHANSEL(4,i) <= 0 => all IFs BPASS, CPASS, AVSPC use the center 75% of the channels for any IF for which no ICHANSEL was specified. ----------------------------------------------------------------