Plot rendering error: <Axes: label='<colorbar>'>; metadata = {'Entries': 153310, 'Name': 'ThresholdDist-0', 'Overflow': 227.0, 'Type': 'Histo1d', 'Underflow': 58.0, 'x': {'AxisTitle': 'Threshold [e]', 'Bins': 31, 'High': 1655.0, 'Low': 1345.0}, 'y': {'AxisTitle': 'Number of Pixels'}, 'z': {'AxisTitle': 'z'}}