R help - Nov 2011 - heteroscedastic bivariate distribution with linear regression - prediction interval

Dear forum,

which is the most suitable method to get the prediction interval of a
bivariate normal distribution which is consistent with a linear model y = ax
+ b?

I assume it is gls + predict. Am I correct? I'm rather new to R. 
Is there some reliable sample code for that problem?

Thank you
best regards

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