unexpected/erroneous behavior of method plot_td of BoltzmannSampler
for BoltzmannSampler s: s.plot_td("x.pdf") yields error output; in contrast s.plot_td("x.dot") works w/o error, but writes x.pdf
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for BoltzmannSampler s: s.plot_td("x.pdf") yields error output; in contrast s.plot_td("x.dot") works w/o error, but writes x.pdf