; MAPIT_MX ;--------------------------------------------------------------- ;! MX adverbs not changed by MAPIT ;# Task Imaging ;----------------------------------------------------------------------- ;; Copyright (C) 1995-1996, 2002 ;; 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 ;----------------------------------------------------------------------- MAPIT LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC MAPIT_MX: MX Adverbs not changed by MAPIT BCHAN 0.0 8192.0 Low freq. channel 0 for cont. ECHAN 0.0 8192.0 Highest freq channel CHANNEL Restart channel number NCHAV Number of chan. to average. CHINC Channel incr. between maps. BIF First IF in average. EIF Last IF in average. NFIELD 0. 64. Number of fields (max. 64) FLDSIZE 0. 4096. Size of each field. RASHIFT RA shift per field (asec) DECSHIFT DEC shift per field (asec) ZEROSP 0-spacing flux and weights XTYPE 0. 10. Conv. function type in x YTYPE 0. 10. Conv. function type in y FLUX * Minimum CLEAN component (Jy) MINPATCH * 0.0 179. Min. BEAM halfwidth in AP. PHAT 0.0 999.0 Prussian hat height. DOTV * -1.0 64.0 >0 => display residual field CMETHOD * Modeling method:'DFT','GRID' ---------------------------------------------------------------- MAPIT_MX Type: Adverbs Use: MAPIT_MX is the list of adverbs for task MX which are not set by the automated mapping and self-calibration procedures called MAPIT. These adverbs can be set by the user to improve the final image quality. Note: Other (more commonly changed) Adverbs for MX are include in the MAPIT help file. Also Note: MAPIT is primarily for continuum data. The Spectral Line adverbs may be used to create a continuum data set however. Adverbs: BCHAN......First channel number to image, 0=>1. Channel numbers are 1 relative as defined in the input data file. ECHAN......Highest channel number to image, 0=>BCHAN There is a limit of 46655 channels. CHANNEL....To restart a map/CLEAN with a given frequency channel, specify that (input) channel in CHANNEL NCHAV......If NCHAV is the number of channels to be averaged together in in the gridding process. CHINC......Number of input channels to skip between images. BIF........The lowest numbered IF to include. Multiple IFs can be included in a bandwidth synthesis average. 0 => 1. EIF........The highest numbered IF to include. 0 =>highest. Note: not all data sets will have IFs. NFIELD.....The number of fields to map in the antenna beam. Up to 64 are allowed but should be non over lapping. FLDSIZE....(X,Y) field size in pixels for the component search during cleaning; one per field. Should be in the range 32X32 to 4096X4096. Output image size will be increased to the next highest power of two, but only the region specified will be searched for components. Default is IMSIZE-10 RASHIFT....RA shift of the phase center of each field from the tangent point of the uv data in asec. Map center = tangent point + shift. If X>0 shifts map center to east. NOTE: RASHIFT and DECSHIFT are not strictly a shift in RA and dec. The effect of RASHIFT on the RA of the map center is roughtly RASHIFT/COS(dec). If the uv data has been rotated then RASHIFT and DECSHIFT refer to X and Y in the new coordinate system. (Note: RASHIFT and DECSHIFT are modified if the MAPIT adverb DOCENTER is TRUE!) DECSHIFT...Declination shift of map center from tangent point of each field in asec. Map center = tangent point + shift. If Y>0 shifts map center to north. UVBOX......(U,V) box size for smoothing. See EXPLAIN MX ZEROSP.....(1)= zero spacing flux density for the polarization being processed. See HELP ZEROSP XTYPE......Convolution function type in X-direction 1=Pillbox, 2=exponential, 3=Sinc, 4=Exp*Sinc, 5=Spheroidal, 6=exp*BESSJ1(x)/x. <= 0 or > 5 -> 5. YTYPE.....Convolution function type in Y-direction FLUX......Stop CLEAN when abs(resid. image max) < FLUX (Jy) IF FLUX < 0 then Clean stops at first negative Clean Component. MINPATCH..Minimum half width of the portion of the beam which is used in the AP minor CLEAN. DOTV......Display residuals on TV channel 1. > 0 => display the inner 512X512 of field number DOTV - 1. If true, you may stop the CLEANing with TV button D after each residual map is displayed. CMETHOD...This determines the method used to compute the model visibility values. 'DFT' uses the direct Fourier transform, this method is the most accurate. 'GRID' does a gridded-FFT interpolation model computation. ' ' allows the program to use the fastest method. ----------------------------------------------------------------