As we noted earlier, Kepler's law is frequently written in the form
Tᶦ = Kαʲ
Use the fact that this may be rewritten as
T = (K)⁽¹/ʲ⁾α⁽ʲ/ᶦ⁾
to determine the simplest (i.e., smallest) possible integers i and j consistent with your fit, and write down the above equation with these integers.