The plot below shows the total errors, statistical and systematic, for the cross section measurement.  The inner tick marks on the error bars represent the statistical errors.  The outer ticks represent the statistical and point-to-point systematic errors added in quadrature.  The grey band shows the systematic error from the BEMC gain calibration uncertainty, which we have agreed to separate from the others (as it cannot be meaningfully added in quadrature to the other uncertainties).