From gmoellen@aoc.nrao.edu Tue Oct 29 13:38:19 2002 Date: Tue, 29 Oct 2002 13:32:44 -0700 (MST) From: George Moellenbrock Reply-To: aips2-naug@donar.cv.nrao.edu To: aips2-naug@zia.aoc.NRAO.EDU Subject: [Aips2-naug] new in ms tool: uvlsf and ptsrc Gang, As advertised last week in the NAUG meeting, the ms tool has two new functions: uvlsf (available in weekly and daily) and ptsrc (available in daily as of today, Oct 29). Both have doc pages in the User Ref Manual. In a nutshell, here is what they do: uvlsf - continuum subtraction in the uv-plane via polynomial fits to the measured and calibrated spectra. It doesn't allow for image-plane shifting nor flagging _yet_, but unlike aips, you can specify an integration time per fit. ptsrc - averages visibilities over time and baseline (per field and spw) to yield a single-pixel (at the phase center) "image". It reports Stokes IQUV. This is useful for obtaining a full-Stokes model from P- and G-calibrated data for use in D calibration (only if a point source is a good assumption for your D calibrator). (This replaces the pre-D-calibration imaging step currently described in the VLA cookbook chapter and used in the summer school tutorials.) Currently, spectral line data will be averaged over channels; channel selection will be available in future (and maybe a spectrum plot?). Both of these functions are currently implemented in glish, and so (particularly for uvlsf which works pretty hard in the fitting) they won't be lightening fast for large datasets until migrated to c++. Give them a spin and submit any problems/suggestions to the defect system. Have fun, George -- _______________________________________________ Aips2-naug mailing list Aips2-naug@listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/aips2-naug