Here they are...
This is the left border with 3 luminance steps, black, blue and light blue. The interesting thing here is I can no longer tell exactly where the transition from blanking to border is exactly as there is no longer a spike at the start of the border.
Because of the limitations of the scope which cannot offset the trigger more than 4 divisions to the right, the end of the scanline was more difficult to capture and the horizontal resolution is one step lower.
Here too, the transition from border to blanking cannot be identified. However, once more because of the limitations of the scope, you can see a bit of the sync at the extreme right.
Looking at these close ups, it seems my initial measure of 570mV for light blue was a bit too high. Seems more like 540mV.
No one can do everything. Everyone can do something.