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xxxxxxxxxx virtual void predictComponents(casacore::Bool& incremental, casacore::Bool& initialized, casacore::MS::PredefinedColumns Type=casacore::MS::MODEL_DATA);//# SkyEquation.h: SkyEquation definition//# Copyright (C) 1996,1997,1998,1999,2000,2002,2003//# Associated Universities, Inc. Washington DC, USA.//#//# This library is free software; you can redistribute it and/or modify it//# under the terms of the GNU Library General Public License as published by//# the Free Software Foundation; either version 2 of the License, or (at your//# option) any later version.//#//# This library 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 Library General Public//# License for more details.//#//# You should have received a copy of the GNU Library General Public License//# along with this library; if not, write to the Free Software Foundation,//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.//#//# Correspondence concerning AIPS++ should be adressed as follows://# Internet email: aips2-request@nrao.edu.//# Postal address: AIPS++ Project Office//# National Radio Astronomy Observatory//# 520 Edgemont Road//# Charlottesville, VA 22903-2475 USA//#//#//# $Id$namespace casacore{class UVWMachine;template <class T> class ImageInterface;template <class T> class TempImage;}namespace casa { //# NAMESPACE CASA - BEGIN// <summary> Relate Sky brightness to the visibility </summary>// <use visibility=export>// <reviewed reviewer="" date="" tests="" demos="">// <prerequisite>// <li> <linkto module="MeasurementComponents">MeasurementComponents</linkto> module// </prerequisite>//// <etymology>// Sky Equation encapsulates the equation between the sky brightness// and the visibility (or coherence) measured by a generic instrument// </etymology>//// <synopsis> // This is responsible for the Sky-based part of Measurement Equation of the Generic// Interferometer due to Hamaker, Bregman and Sault and later extended// by Noordam, and Cornwell.//// See <linkto module="MeasurementEquations">MeasurementEquations</linkto>// for more details of the form of the SkyEquation.//// The principal use of SkyEquation is that, as described in // <linkto module="MeasurementEquations">MeasurementEquations</linkto>,// the gradients of chi-squared may be calculated and returned// as an image.//// The following components can be plugged into SkyEquation// <ul>// <li> Antenna-based direction-dependent terms: <linkto class="SkyJones">SkyJones</linkto>// <li> Sky brightness model: <linkto class="SkyModel">SkyModel</linkto>// <li> Fourier transform machine: <linkto class="FTMachine">FTMachine</linkto>// </ul>// </synopsis> //// <example>// <srcblock>//// // Read the VisSet from disk// VisSet vs("3c84.MS");//