def leftoverrow(sizes, x, y, dx, dy):
    """
    Compute relative x-axis start, y-axis start, width, and height of overall
    treemap area when remaining width exceeds remaining height (dx >= dy)

    :param sizes: List of values normalized with respect to overall height (dy)
        and width values (dx)
    :param x: Remaining area start point on treemap x-axis
    :param y: Remaining area start point on treemap y-axis
    :param dx: Remaining treemap width
    :param dy: Remaining treemap height
    :return: Tuple of remaining area dimensions

    """
    covered_area = sum(sizes)
    width = covered_area / dy
    leftover_x = x + width
    leftover_y = dy
    leftover_dx = dx - width
    leftover_dy = dy
    return leftover_x, leftover_y, leftover_dx, leftover_dy
