dof.tr <- function(var.st){
var.st <- ifelse( var.st > 5.51, 5.51, var.st ) # can't b over 250
var.st <- ifelse( var.st < -10, -10, var.st )
vao <- exp(var.st) + 2
list(var.st = var.st, vao = vao )
}
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