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Please be aware, that the size of the domain of the external data must be larger then the size of the actual COSMO-CLM domain. At least two additional rows of grid points at each of the four sides of the domain are required. It is recommended to chose the domain of the external data set rather large, so that it is possible to change the size of the COSMO-CLM domain, with shifts of start_lon and start_lat, etc. without creating new external data sets.
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