; ALTDEF ;--------------------------------------------------------------- ;! Sets frequency vs velocity relationship into image header ;# VERB CATALOG SPECTRAL COORDINATES ;----------------------------------------------------------------------- ;; Copyright (C) 1995, 1998, 2009 ;; 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 ;----------------------------------------------------------------------- ALTDEF LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ALTDEF: Verb to modify velocity vs frequency relationship INNAME Image name(name). INCLASS Image name(class). INSEQ 0.0 9999.0 Image name(seq. #). 0=>high INDISK 0.0 9.0 Disk drive #. 0=>any AXTYPE 'OPT' or 'RAD' plus 'LSR', 'HEL', or 'OBS' AXVAL Velocity at (new) ref. pixel= AXVAL(1) + AXVAL(2). AXREF Reference pixel location RESTFREQ 0.0 1.E20 Rest frequency in HZ = RESTFREQ(1) + RESTFREQ(2) ---------------------------------------------------------------- ALTDEF Type: Verb Use: ALTDEF is used to add or alter the description in the catalogue map header of the relationship between the spectral-line velocity and the frequency. The verb ALTSWTCH is used to select which description is normally used in labeling the image. Adverbs: INNAME......Image name(name). Standard defaults. INCLASS.....Image name(class). Standard defaults. INSEQ.......Image name(seq. #). 0 => highest. INDISK......Disk drive # of image. 0 => any. AXTYPE......Two-part string choosing 'OPT'ical or 'RAD'io definition of velocity and 'LSR', 'HEL'iocentric, or 'OBS'erver velocity zero-point. The latter choice only affects labeling. For example, AXTYPE = 'RAD LSR' selects the LSR-relative velocities in the radio convention. 'LSR' and 'OPT' are the defaults. AXVAL.......Velocity at (new) reference pixel. Value is AXVAL(1) + AXVAL(2) in double precision. No default. Units are meters/sec. AXREF.......Reference pixel location for velocities. No default. RESTFREQ....Line rest frequency in Hz = RESTFREQ(1) + RESTFREQ(2) in double precision. ----------------------------------------------------------------