Two identical points on a XY Graph not showing at same location

[ajbradford]

Why isn't the smaller yellow point in the dead center of the red one, as is anticipated for two points with the same coordinates? Here are two examples where the only thing different is the Plot appearance. 2024 Q3.

Code:

Front Panel example 1:

Front Panel example 2:

My guess is that this is a "feature" of plots and I should use a picture instead.

[mcduff]

I think it is due to the different line widths used for the points.

[altenbach]

There is no subpixel positioning (similar to antialiasing) and everything is quantized to pixels. If you mix dots with even and odd number of pixels across, it is impossible to align them. One has the center on a pixel and one has the center halfway between two pixels.

(But I agree it looks worse than that, especially with large dots 😄 )

[Jay14159265]

must be an optical illusion I see a white square 

[billko]

---

@Jay14159265 wrote:

must be an optical illusion I see a white square 

---

The two squares are actually the same size!