====== Controlling the Output of RooFit ======
===== In General =====

The most systematic approach to controlling the output of RooFit is accessing the streams of the message service directly.
The first thing is to check the instance of the RooMsgService:
<code C>
RooMsgService::instance().Print() ;
</code>
This will tell you which streams exist and what they comprise. Note that error messages can appear in several strings at once.
You can then access the stream and remove a certain topic:
<code C>
RooMsgService::instance().getStream(1).removeTopic(RooFit::Eval);
</code>

The topics are:
<code C>
RooFit::Eval
RooFit::Generation
RooFit::Minimization
RooFit::Plotting
RooFit::Fitting
RooFit::Integration
RooFit::LinkStateMgmt
RooFit::Caching
RooFit::Optimization
RooFit::ObjectHandling
RooFit::InputArguments
RooFit::Tracing
RooFit::Contents
RooFit::DataHandling
RooFit::NumIntegration
RooFit::Eval
</code>

===== Switching the MIGRAD output off =====
The above commands don't switch the MIGRAD output off, that goes to stdout after every fit. In order to do this, do:
<code>
RooFitResult* rForward = forward.fitTo( *forwardBS, RooFit::PrintLevel(-1) );
</code>
which will make your fit silent.