[Gmsh] negative z values in version 4.3.0

[Komal Kumari]

I am generating msh file in version *4.3.0* and exporting it in *version 2
ASCII* format because I have written code to read *2.2 0 8* MeshFormat. In
it some of the z-coordinate are showing negative values. However, if I am
generating msh file in version *2.7.0 *using the same geo file used
earlier, no negative values is there but appropriate Physical names are not
coming.I am attaching geo file ad msh file of both version. Please let me
know how to tackle negative z values.
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