[Gmsh] Problem consulting of gmsh

[飘]

Hello. I am a students from chinese, I'm using the 3.06 version of gmsh software，I am using gmsh to view the mesh that I generated with meshParasol and to know how to check the quality of the overall mesh. I am wondering how to check the quality of specific elements.  I was able to generate statistics of the mesh using the "Tools -> Statistics" button in gmsh, but I am unsure what all of the data means.  I also plotted the gamma, eta, sicn，and rho, but I do not know exactly how those plots relate to the quality of the mesh.I hope you can tell me how to check the quality of the overall mesh.
 Thank you for your help.
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