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\section{Introduction}  HVCs are a unique window into our cool CGM and the processes of inflow and outflow. Usual soapbox issues about accretion rates, tracing of larger scale flows.  Distances are critical for disentangling the qualitative and quantitative picture of the whole system of HVCs.  Distances are known for the almost every HVC complex. Many of these are published. Distance data is in hand for the remainder of the HVC complexes