AD8003 amplifier bandwidth under spice

Good day

I am simulating a +1 gain amplifier using the AD8003 model under spice. It seems possible to reduce the bandwidth playing with the series resistor rather than the feedback resistor. Is it a reliable behaviour? If yes, what would be the physical reason? I don't find any information in the CFB opamp litterature.

For instance with a 1kohms serie resistor I can reduce the bandwidth whereas changing the Rfeedback resistor from 680 to 4kohms doesn't change.  

Thank you

RB

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