I am trying to understand what values I should put in for the following arguments.  For example how many iterations should I use.  What is a good value for span, df etc.?  Can anyone guide me?  Is there a good reference source for this information?

normalizeWithinArrays(object, layout, method="printtiploess", weights=object$weights, span=0.3, iterations=4, controlspots=NULL, df=5, robust="M", bc.method="subtract", offset=0)

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