$par
[1] 1994.9999514 1998.3471683 2016.0003465 2019.2175343    0.5356223

$objective
[1] 6.143483

$convergence
[1] 1

$iterations
[1] 128

$evaluations
function gradient 
     200      712 

$message
[1] "function evaluation limit reached without convergence (9)"

