X and Y calibration model

I was experiencing very strong astigmatism on my printer (circles coming out as ovals) regardless that square or rectangular shapes were coming out totally fine. So here is a quick calibration model combining both types of shapes I came out with in order to solve the problem with M92 adjustments.

Original dimensions :
- Circle
. Outer diameter 140.00 mm
. Inner diameter 136.00 mm
. Thickness 1.00 mm
- Cross
. Length in X and Y 120.00 mm
. Width of arms 2.00 mm
. Thickness 1.00 mm

Measurements meant to be made using a caliper directly on the COLD bed before removing (in case you have a heated bed like me).

For the circle I measured X direction, Y direction and +/-15°, +/-30°, +/-45°, +/-60° and +/-75° from my Y axis for more precision.

NB : If your first layer is thicker than the others, make sure you don't gab it with your caliper.