@caesarcrypto When you load the ex4 indicator, check the colors tab.
Those are the displayed buffers.
This indicator is useful when same color is assigned to more than one buffer, and so on. It should display the buffer with gray line. If nothing is shown, it is possible that it is empty value.
Proceed to the next buffer. Instead of buffer 0, write 1, then 2, etc... -1 means it should not track buffer there.
Otherwise, everything looks ok, as how you did.
C