If present in the calling sequence used to produce
data frame used to fit the model is obtained.
## S3 method for class 'gls' getData(object)
an object inheriting from class
data argument is present in the calling sequence that
object, the corresponding data frame (with
subset applied to it, if also present in
the call that produced
object) is returned;
NULL is returned.
José Pinheiro and Douglas Bates email@example.com
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