[Gmsh] How get into a Field the element size given by the default gmsh strategy (based on points characteristic length) ?

[NENNIG Benoit]

Dear Gmsh developers and users,

Is there a way to built a Field that returns the local Characteristic Length 
obtained by using the point specification

Mesh.CharacteristicLengthFromPoints=1;
Mesh.CharacteristicLengthExtendFromBoundary = 1;
lc = .15;
Point(1) = {0.0,0.0,0,lc};
...
Field[1] = ????

I mean : how to get into a Field variable the size given by the default gmsh 
strategy that linearly interpolate all points Characteristic Length.

Thanks,

Benoit

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