nullIndexRange Parameter
Some programs allow you to specify which real and null (that is, randomized) runs you want.
For example, for the real run and 10 null runs,
-1,0-9
OR
-1-9
The so-called null index of the real run is -1. All null indexes with value of 0 or greater refer to actual nulls.
For example, for just the real run
-1
For 30 nulls
0-29
The real run, and nulls 2 through 5 and 15 through 20
-1,2-5,15-20