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What does the 'DEPOP' in HMC7044_EVAL_Schematic mean?

Hi,

I noticed that some components were marked DEPOP in the HMC7044_EVAL_Schematic, but in the HMC7044_EVAL_BOM, It's descripition is ' DO NOT POPULATE COMPONENTS'.

So does 'DEPOP' mean that these positions cannot be changed or do not place components?  

Thanks.