Creating a marker values color ramp for an intensity graph apparently requires:
A stacked sequence with 4 frames.
- In the first frame, we define the variables and place all terminal disconnected inside it.
- In the second frame we ensure that Max>Min, requiring a case structure, a temporary "variable" and a three frame flat sequence (picture 1)
- In the third frame we calculate several intermediary variables
- In the last frame, we create the ramp, e.g. converting a DBL to U32 that then gets immediately coerced 3x to U8 (picture 2)
- (The problem is that the result is incorrect, for example the max never appears in the output.)
Picture 1

Picture 2

I think this does it better:
