Cheers, the correct way is actually how I had written it.. until the moment right before I posted it and re-read the original code! Why does the short length period code come before the price code in the PRT version? I mean are we not taking the std of price movements?

Also it should also give negative values and look like the Think or Swim (white) image’s indicator scale? (Note my unused green zero line – in my PRT black image).