You can define zones on the leading edge of the blade for bestfit parameters and CONTARC calculations.
Two radii define the LE zones. Two arcs swing about the nose point to intersect the CVX and CCV sides. The zones are the parts of the curve that fall between the intersection points. There are two zones:
One on the CVX side
One on the CCV side
The fits and calculations can use the CVX zone, the CCV zone, or both zones.
LE zones