0,0 should be a gradient from yellow, green to blue (default)
1,0 should be half yellow, then a gradient to green and blue (Absolute)
2,0 should be a gradient from yellow, green to blue (RelativeToBoundingBox)

0,1 should be half yellow, then a gradient to green and blue
1,1 should be half yellow, then a gradient to green and blue
2,1 should be a gradient from yellow, green to blue