how to reduce fitting error for a model after using parameter estimation tool in simulink

2020 9 21
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after using parameter estimation app in simulink and enter the measured data and for input of a current and output of a voltage as real data and having 4 parameters to estimated them in the model. there is a large error of fitting between the 2, even i changed my initial guess and make boundry for parameters also the scale
take a look :
our entered data
simulation estimation and simulated data:

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