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CRTL, j0,j1,jn, Return Values
 *Conan The Librarian 

    x                  The relevant Bessel value of x of the first
                       kind.
    0                  The value of the x argument is too large, or
                       underflow occurred; errno is set to ERANGE.
    NaN                x is NaN; errno is set to EDOM.
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