Compile and run p_mu.f.

e2_01 questions and answers: (output of p_mu.f)
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1. How many recursions and how many sweeps are needed for the
   first tunneling event? 

   388 recursions and 29 297 sweeps.

   What is the acceptance rate during this part of the run?

   With nmucasw=20 the acceptance rate is 20*388/29 297=0.265.

2. Answers to the same questions for ten tunneling events:
   787 recursions and 64 138 sweeps and acceptance rate 0.245.

3. The average acceptance rate during the 10,000 sweeps for
   equilibration is 0.245.

4. 84 tunnelings are found during the measurement period.

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Then:
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Move the data file mu2d02q020.dat to e2_03, run the analysis program and
plot with the fln.plt gnuplot driver files.