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ADA4938 simulation model

For the ADC amplifier ADA4938. I have a ltspice simulation linked here.  I can plot the supply currents but it does not pull symmetrically for the +5V and -5V rails. 

Is there a reason why the model suggests unequal current draw? 

I would have guessed both supplies would be the same, assuming a pushpull output stage. 

The +5V rail is almost 60mA and the -5V rail is at -23mA.  

I was able to download the file from these forums at the link here: