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This routine reads the user specifications for the output nest. *
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Author: A. Stohl *
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4 June 1996 *
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Variables: * dxoutn,dyoutn grid distances of output nest * numxgridn,numygridn,numzgrid nest dimensions * outlon0n,outlat0n lower left corner of nest * outheight(maxzgrid) height levels of output grid [m] * * Constants: * unitoutgrid unit connected to file OUTGRID * *