This is referencing a plot. The first 1 means plot one bar back and the  means use the value from one bar back in that plot. This is usually used to join two different line plots together when the color changes else you might get a one bar blank spot.
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Mike, thanks for tip. That is actually where I started. I ran your code but the display was nothing like the NT indicator that supposedly does the same thing. I could not really tell why, hence I needed to convert line-by-line directly from the NT script to see where the discrepancy was. I believe the code difference is minor but the resulting display differences are not.
If you are familiar with Ninja script I would appreciate if you take a quick look at the attached, maybe something will jump out at you.