HMC6981 pins: Vref and Vdef

If the Vref and Vdef are not used, can they be left as NC or do they need to be connected to GND? 
The datasheet doesn't mention that 
www.analog.com/.../hmc6981.pdf



Fixed part number in title
[edited by: aandrews at 9:30 AM (GMT -4) on 14 May 2021]
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