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The ENS IFS model uses a Gaussian grid (O640O1280) which has 640 1280 latitude lines between pole and equator with the number of grid points on each latitude line rising from 20 near the poles to 2576 5136 near the equator giving a resolution of about 18km9km.

The Extended Range ENS IFS model uses a Gaussian grid (O320) which has 320 latitude lines between pole and equator with the number of grid points on each latitude line rising from 20 near the poles to 1296 near the equator giving a resolution of about 36km.

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