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In addition to @acd1's answer I want to clarify that the number of steps are:
Nsteps = (Rmax-Rmin))/STEP = (1.1-0.9)/0.00606060606 = 33.
The number of tap changer positions are always Nsteps+1, i.e. NPOS = 33+1 = 34 in this case. Normally, the number of positions are odd numbers so there may be something wrong with the given data here. With 33 tap positions the steps size would be: STEP = 0.2/(33-1) = 0.00625!
