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The output of glxinfo command is

 glxinfo |grep Open
    Vendor: Intel Open Source Technology Center (0x8086)
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2) 
OpenGL core profile version string: 4.5 (Core Profile) Mesa 13.0.2
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 13.0.2
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.2 Mesa 13.0.2
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
OpenGL ES profile extensions:

The "core profile version" is 4.5, while the "version string" is 3.0 . Which of these numbers is telling me which OpenGL version my graphic card is using? Also, what are the ES entries for?

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OpenGL ES is for Embedded Systems see Wikipedia. If you look at Mesa release notes for version 13.0.2 you will see it claims to support OpenGL 4.4. I cannot make more sense of it.

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