; SPECTRAL ;--------------------------------------------------------------- ;! Information about SPECTRAL ;# INFORMATION GENERAL ;----------------------------------------------------------------------- ;; Copyright (C) 1995-2000, 2003-2005, 2008 ;; 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 ;----------------------------------------------------------------------- SPECTRAL LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- Almost all parts of AIPS are general enough to handle mutiple dimensions of data including multiple frequency channels in the uv domain and 3 or more dimensional "cubes" in the image domain. **************************************************************** List of verbs, adverbs, tasks in category SPECTRAL ACFIT Determine antenna gains from autocorrelations ALTDEF Sets frequency vs velocity relationship into image header ALTSWTCH Switches between frequency and velocity in image header AVSPC Averages uv-data in the frequency domain BASRM Task to remove a spectral baseline from total power spectra BCHAN sets the beginning channel number BLOAT converts line data to greater number channels BLSUM sums images over irregular sub-images, displays spectra BPASS computes spectral bandpass correction table BPASSPRM Control adverb array for bandpass calibration BPERR Print and plot BPASS closure outputs BPLOT Plots bandpass tables in 2 dimensions as function of time BPSMO Smooths or interpolates bandpass tables to regular times BPVER specifies the version of the bandpass table to be applied CHANNEL sets the spectral channel number CHANSEL Array of start, stop, increment channel numbers to average CHINC the increment between selected channels CPASS computes polynomial spectral bandpass correction table CVEL shifts spectral-line UV data to a given velocity ECHAN define an end for a range of channel numbers FIXAL least squares fit aliasing function and remove FLGIT flags data based on the rms of the spectrum FRMAP Task to build a map using fringe rate spectra FRPLT Task to plot fringe rate spectra FXALIAS least squares fit aliasing function and remove HLPSPFLG Interactive time-channel visibility Editor - internal help HLPTVHUI Interactive intensity-hue-saturation display - on-line help HLPTVRGB Interactive red-green-blue display - on-line help ICHANSEL Array of start, stop, increment channel #S + IF to average IMLIN Fits and removes continuum emission from cube IRING integrates intensity / flux in rings / ellipses ISPEC Plots and prints spectrum of region of a cube MCUBE collects n-dimensional images into n+1-dimensional image NCHAV Number of channels averaged in an operation ORDER Adverb used usually to specify the order of polynomial fit PLCUB Task to plot intensity vs x panels on grid of y,z pixels POSSM Task to plot total and cross-power spectra. SDLSF least squares fit to channels and subtracts from SD uv data SDVEL shifts spectral-line single-dish data to a given velocity SERCH Finds line signals in transposed data cube SMOTH Task to smooth a subimage from upto a 7-dim. image SPECINDX Spectral index used to correct calibrations SPFLG interactive flagging of UV data in channel-TB using the TV SQASH Task to collapse several planes in a cube into one plane SYSVEL Systemic velocity UJOIN modifies UV data converting IFs to spectral channels UV2TB Converts UV autocorrelation spectra to tables UVBAS averages several channels and subtracts from uv data. UVDEC Decrements the number of spectral channels, keeping every nth UVGLU Glues UV data frequency blocks back together UVLIN Fits and removes continuum visibility spectrum, also can flag UVLSD least squares fit to channels and divides the uv data. UVLSF least squares fit to channels and subtracts from uv data. UVMLN edits data based on the rms of the spectrum UVMOD Modify UV database by adding a model incl spectral index VBGLU Glues together data from multiple passes thru the VLBA corr. VTEST Measures velocity discrepancy across fields WTSUM Task to do a a sum of images weighted by other images XBASL Fits and subtracts nth-order baselines from cube (x axis) XGAUS Fits 1-dimensional Gaussians to images XPLOT Plots image rows one at a time on the graphics or TV screen