$par
[1] 1966.4938053 2013.2979659 2013.3999453 2026.7652805    0.9698062

$objective
[1] 1.640927

$convergence
[1] 0

$iterations
[1] 87

$evaluations
function gradient 
     122      481 

$message
[1] "relative convergence (4)"

