figure 3-11 illustrates the (T,OUL) replenishment process. the horizontal axis is time and the vertical axis is units,in this case, bars of soap. the dashed line across is the order up to level(OUL); q1 is the first order, and q2 is the second order; the dotted line is the point in time where a review is made; the bold dotted line is when a replenishment is received and available for use; the bold double-headed arrows represent the lead time; and the regular double-headed arrows represent the time betweenreviews.