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use strict;
use warnings;
...
        <CellRefinementLevel></CellRefinementLevel>
    </params>
</task>

<task>
    <params>
        <CellRefinementLevel>7</CellRefinementLevel>
    </params>
</task>

$PARAMS{'CellRefinementLevel'}=7;
$PARAMS{'GridCellSizeInXDirection'}=100;
$PARAMS{'GridCellSizeInYDirection'}=100;

CellRefinementLevel=7
GridCellSizeInXDirection=100
GridCellSizeInYDirection=100

@ARGV = 'noname.txt'; # omit if config file passed on the command line
my %PARAMS = map {chomp; split '='} grep {length} <>;