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igamma(a, x [, /complement, /log])
Returns the lower normalized incomplete gamma function: integral over
t from 0 to x of
exp(-t)*t^(a-1)/gamma(a), for a positive
and x nonnegative. If keyword /complement is
specified, then one minus the integral is returned. If keyword
/log is specified, then the natural logarithm of the result is
returned instead.