8.10.6 beamMap(self,chanList=[],phase=0,flag=0,oversamp=2.0,sizeX=[],sizeY=[]):

beamMap $<$ Map(BoaDataAnalyser.DataAna): $<$ BoaMapping.py

	DES: build a beam map in (Az,El) coordinates
        INP: (int list) chanList = channels to consider
             (int) phase = phase to plot
             (int) flag  = flag values to consider
             (float) oversamp = oversampling factor (beam fwhm / pixel size). Default=2.
             (list float) sizeX = limits in Az of the map
             (list float) sizeY = limits in El of the map