gtfill(x,y1,y2,n,c1​,c2)

Fill the areas between two curves that cross at multiple pts, with different colors under each curve

This function fills the areas between two curves that intersect at multiple
points. The area where curve 1 > curve 2 is filled in one color, and the
area where curve 2 > curve 1 is filled in another color.
It performs piecewise interpolation so that the area is completely filled, even if the intersections are between defined points.