For the above purpose, I have used the following graphs.

1. Log torque vs. Log spindle speed (N) ------ To get the flow behavior index (n) value: SLOPE: n

2. Log shear stress vs. Log shear rate --------- To get the consistency index (K) value: INTERCEPT: y-axis = log K

However, my consistency index (K) values are contradictory with literature as 3533.5, 3629, etc. I want to know whether my steps are correct.