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On Thu, Jun 2, 2016 at 2:41 PM, Ed Hartnett <edwardjameshartnett@xxxxxxxxx> wrote: > I don't think the fact that it is an unlimited dimension should make it > any slower, either in classic > <snip> Ed, I have experienced this slow down many times with Netcdf-3 classic. As I said earlier, if the format is classic, then a coordinate variable on the unlimited dimension is scattered throughout the file. This is confirmed in the Users' Guide. At the low level, many disk blocks must be read to get the complete coordinate array. --Dave
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