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The IFS medium range ensemble including Ensemble Control Forecast (ex-HRES) use a Gaussian grid (O1280) which has 1280 latitude lines between pole and equator with the number of grid points on each latitude line rising from 20 near the poles to 5136 near the equator giving a resolution of about 9km. The Ensemble Control Forecast (ex-HRES), and the 15 day medium range ensemble members use this grid.
The IFS sub-seasonaled seasonal range ensemble 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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