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This routine reads the user specifications for the output grid. *
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Author: A. Stohl *
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4 June 1996 *
HSO, 1 July 2014
Added optional namelist input
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Variables: * dxout,dyout grid distance * numxgrid,numygrid,numzgrid grid dimensions * outlon0,outlat0 lower left corner of grid * outheight(maxzgrid) height levels of output grid [m] * * Constants: * unitoutgrid unit connected to file OUTGRID * *