/usr/share/doc/netgen-doc/examples/shell.geo is in netgen-doc 4.9.13.dfsg-8build2.
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solid main = sphere (0, 0, 0; 1)
and not sphere (0, 0, 0; 0.98);
# or orthobrick (-0.4, -0.4, -0.4; 0.4, 0.4, 0.4);
tlo main -maxh=0.02;
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