Stochastic Spread Histogram

[stepwise]

Hi there,

I would like to either create or modify an indicator to display the spread between the %K and %D lines as a histogram.

The scale of this spread would be -50 to 50.

Ideally, the histogram would overlay the lines (but the lines have a different scale of 0 to 100 - so not sure this is possible).

Any advice on what the code would be for this?

Many thanks!