code: def _update_srcmap(self, name, src, **kwargs):
          
  
          k = self._create_srcmap(name, src, **kwargs)
          scale = self._src_expscale.get(name, 1.0)
          k *= scale
  
          # Force the source map to be cached
          # FIXME: No longer necessary to force cacheing in ST after 11-05-02
          self.like.logLike.sourceMap(str(name)).model()
          self.like.logLike.setSourceMapImage(str(name), np.ravel(k))
          self.like.logLike.sourceMap(str(name)).model()
  
          normPar = self.like.normPar(name)        
          if not normPar.isFree():
              self.like.logLike.buildFixedModelWts()
docs: Update the source map for an existing source in memory.