Plot rendering error: <Axes: >; metadata = {'Entries': 153589, 'Name': 'ThresholdDist-0', 'Overflow': 6.0, 'Type': 'Histo1d', 'Underflow': 0.0, 'x': {'AxisTitle': 'Threshold [e]', 'Bins': 231, 'High': 3125.0, 'Low': 815.0}, 'y': {'AxisTitle': 'Number of Pixels'}, 'z': {'AxisTitle': 'z'}}