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Exercise 4: Implement a FORTRAN 90 version of the parallel Monte Carlo particle tracing algorithm on any architecture.

First, finish Exercise 3 above. Then, convert the working code to FORTRAN 90. Run the same example as above, and verify that your answers are the same. (Note: Cray has FORTRAN 90 compilers available now. Many IBM RS 6000's have FORTRAN 90 compilers, and there are a variety available for PC's.) Report the results of this exercise to the author of this chapter (send electronic mail to to receive congratulations and be covered with glory.