A factory manufactures pipes that should have an ideal length, represented by 0 on the number line. The quality manager at the factory measures two random pipes, pipe X and pipe Y, from each batch daily. In the first batch today, pipe X had a length that was 0.2 cm less than the ideal length. The difference between the lengths of pipe X and pipe Y was 0.6 cm. Plot all the points on the number line that could represent the length of pipe Y compared to the ideal length.