Figure 9A-4 is the 500-mb constant-pressure map for 12Z 26 October 2021, the same time as Figure 9A-3. The heights that radiosondes detect 500-mb of pressure are reported in the upper right position of the upper-air station models and the heights are plotted as isohypses (contours) in tens of meters, so a "0" needs to be placed to the right of the plotted digits for the actual height