EEDI reference curve line parallel to y axis what does that represent?

Answer

the line parallel to the Y-axis represents a fixed ship capacity, normally DWT. It is drawn from the ship’s capacity on the X-axis upward to meet the EEDI reference curve. The point where it cuts the reference curve gives the reference EEDI value for that ship size. Then, by applying the reduction factor, we get the required EEDI for that ship. So, the vertical line is only a capacity reference line, not the EEDI reference line.”