For background, see the original post. Use whatever estimation units you prefer – days, story points etc.
The v and vv fields will be calculated from the historical velocities hv if these are provided.
Example: pb = 100 (story points), v = 20 (story points per iteration), rc = 2 (story points per iteration), vv = 20 (percent) gives ni = 5.6 and ri = 6.7. You should plan for up to 7 iterations, not the 5 the basic velocity calculation would give you.