Therefore, it is important to ensure that your supplier is grading his notes accurately according to strict standards. Poor, Fair, Good, Very Good, Fine, Very Fine, Extremely Fine and Uncirculated. Of course, a banknote might fall somewhere between any of these grades, so plus-signs are often used to indicate interim grades. If you need the value of the note in an intermediate grade, you have to estimate it for yourself, based on the values and grades given. F will be about 20 and EF will be about 60.
Some banknotes are especially scarce in the higher grades.
Since value is largely based on availability, in these cases there will be a much greater difference in value between EF and UNC than there is from VG to F, for example. Again, we draw a line passing through the three values in order to be able to read off the values of the intermediate grades. This time, the line has to be a curve, to pass through the points we have plotted. In cases like Example 2 above, a slight difference in grade towards the UNC end of the scale makes quite a remarkable difference in value. Plotting a graph, such as those above, is one way of estimating the values of those intermediate grades not given in Pick.