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usage: fred_scan --help | -k key -p program -v variable -o outvar --min min_val --max max_val [ -b params_base | -s -M ]
    -a : if set, prints out the results of each job associated with the scan.
    -b filename:  if set, a file containing parameters to include in each job
    -i value: the increment to be added to the changeable parameters (default = 0.1)
    -k key:   the key for a FRED job (required)
    -m int: the number of parallel jobs to run (default = 1)
    --max minval:  the upper bound for the changeable parameter (required)
    --min minval:  the lower bound for the changeable parameter (required)
    -n int: the total number of jobs to run (default = 1)
    -o outcome:  the FRED output variable for the outcome (required)
    -p program:  the main FRED program file (required)
    -s: if set, save each job (default => jobs are deleted)
    -v parameter:   the parameter variable. (required)
    -M: if set, the scan returns parameter with max outcome (default: return min outcome)


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