; DCHANSEL ;--------------------------------------------------------------- ;! Array of start, stop, increment channel #S + IF to avoid ;# ADVERB CALIBRATION SPECTRAL ;----------------------------------------------------------------------- ;; Copyright (C) 2011 ;; 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 ;----------------------------------------------------------------------- DCHANSEL LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- DCHANSEL 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 to exclude a region of data. 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 dCHANSEL = 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 excluded from the average or flagging or other operation. The fourth element specifies the IF to which the previous three apply. Null Value: 0 A completely null value means no exclusions at all. DCHANSEL(1,i) <= 0 => 1 DCHANSEL(2,i) <= 0 => (i >= 1) -> no more channel sets DCHANSEL(3,i) <= 0 => 1 DCHANSEL(4,i) <= 0 => all IFs Tasks: RFLAG.....Plots histograms of time rms and deviation from robust spectral mean/rms or flags UV data based on these. DCHANSEL selects regions of channels which are not examined at all in the plotting and flagging process. Use it to omit known regions of strong (real) spectral-line signal. ----------------------------------------------------------------