looking at the metrics and Dimension explorer ga:users and ga:newusers look like it can be fetched together but when i select the "Only show fields that are allowed in segments" then ga:users could not be seen does that mean ga:users and ga:newusers cannot be fetched together?
I tried fetching them both together and also ga:source,ga:medium when i verified the numbers with data from UA website the ga:newuser number matches but ga:user number have huge difference