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I try to follow the examples about `Quantum Circuit Plotting with SymPy` but I can not find the output picture. My OS is Ubuntu and I type all the command in the terminal of IPython, see the screen shot please. The output is similar to the one in that website, i.e. <sympy.physics.quantum.circuitplot.CircuitPlot at 0x7f08d7683d50>. But where is the output picture?