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subroutine find_fit(data_y)
real, intent(inout) :: data_y(2)
real :: tol, fvec(2)
tol = sqrt(epsilon(1.0)) * 1e4
fvec = tol
call fcn(fvec)
contains
subroutine fcn(fvec)
real :: fvec(:)
data_y = fvec
end subroutine fcn
end subroutine find_fit
program associate_10
real :: datay(2)
datay = 4.0
call find_fit(datay)
print *, datay
if( abs(datay(1) - 3.45266986) > 1e-6 ) error stop
if( abs(datay(2) - 3.45266986) > 1e-6 ) error stop
end program associate_10
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