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I can´t estimate Transfer Functions with orders higher the Den:2 Nom: 3

Hello,
 
I want to Estimate a transfer function modell with a denominator order = 14 and nominator order = 14. The order must be as high to get a proper
Estimation. Pls see the attached FRF of my system. 
If I select the order to 14 and 14 the Estimate transfer funtion VI only computes a Modell with Denominator order 2 and nominator 3 which
really no good estimtion. Why?
 
Thx for any help!!
 
Greetings
 
RRapha 
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